Introduction

This document lists all changes for the most recent major release (releases with number X.Y) and subsequent minor releases (with numbers X.Y.Z and perhaps further identifiers), including major and important changes and a list of all user-visible modifications. Change History repeats the list of user-visible modifications for this release and includes similar lists for earlier releases.

The release described in the documentation set is 6.4.1.

Release 6.4.1

Release 6.4.1 is a maintenance release with code fixes and enhancements.

Database internal format unchanged from version 6.4.0

The database format is changed from time to time. When the format is changed, databases must be upgraded to the new format before they can be used. Upgrading is discussed in the Database Upgrading document. The format in version 6.4.1 is unchanged from version 6.4.0. (The format was previously changed in release 6.4.0.) Therefore it is not necessary to upgrade 6.4.0 databases for them to be used with 6.4.1. Note that backing up repositories before before using them to a new version is always recommended. Once a database has been used in a later release, it cannot be used in an earlier release regardless of whether or not the database format is the same.

Release 6.4.0

Release 6.4.0 is a major release with significant new features.

The most important and far-reaching change is support for multi-master replication. AllegroGraph has long supported single-master replication, where several AllegroGraph instances share data in a repository, but only one of them can make changes (adding or deleting triples). The rest then catch up. In multi-master replication, even though one instance is identified as the controlling instance, any instance can add or delete triples, with the remainder catching up with those changes while perhaps making other changes of their own. Single-master replication is still supported and is described in the Replication document. The new multi-master replication facility is described in Multi-master Replication.

Database internal format changed from version 6.3.0

The database format is changed from time to time. When the format is changed, databases must be upgraded to the new format before they can be used. Upgrading is discussed in the Database Upgrading document. The format in version 6.4.0 is changed from version 6.3.0. (The format was previously changed in release 6.2.0.) Therefore it is necessary to upgrade 6.3.0 and earlier databases for them to be used with 6.4.0. Note that backing up repositories before before upgrading them to a new version is always recommended. Once a database has been used in a later release, it cannot be used in an earlier release regardless of whether the database format is the same.

Release 6.3.0

Release 6.3.0 is a major release with new features in addition to adding general improvements to and fixing bugs in version 6.2.3. The changes are described below. The most notable new features include:

Database internal format unchanged from version 6.2.3

The database format is changed from time to time. When the format is changed, databases must be upgraded to the new format before they can be used. Upgrading is discussed in the Database Upgrading document. The format in version 6.3.0 is unchanged from version 6.2.3. (The format was previously changed in release 6.2.0.) Therefore it is not necessary to upgrade 6.2.3 databases for them to be used with 6.3.0. Note that backing up repositories before moving them to a new version (whether or not upgrading is required) is always recommended. Once a database has been used in a later release, it cannot be used in an earlier release regardless of whether the database format is the same.

Programmer notes

These sections note changes which may affect how certain operations or code work compared to earlier releases. These are emphasized here because the changes may be unexpected. The complete list of user-visible changes below also mentions these changes in a shorter format.

6.4.1 Programmer notes

6.4.0 Programmer notes

6.3.0 Programmer notes

User visible changes

These sections list changes in the current release and in some earlier releases. See the Change History for a list of changes in all earlier releases.

AllegroGraph 6.4.1

AllegroGraph Server: General Changes

New agtool commands and some changed arguments

The *agtool command-line utility has new commands available. Further some commands have new arguments and some arguments have changed. See the agtool General Command Utility document for details. Most commands now have a --scheme argument which can be http or https.

agtool repl create-cluster adds --if-exists and --force arguments

agtool repl create-cluster previously would only create new, empty repositories and if an existing repository were specified, it would be deleted and a new, empty repository with the same name would be created. (This behavior differed from the behavior when creating clusters with AGWebView, where a repository had to exist and need not be empty when it was converted to an initial replication instance.) Now agtool repl create-cluster accepts an --if-exists argument with allowable values supersede (the default, meaning delete the existing repository and create a new one with the same name), overwrite (same as supersede), use (convert an existing, possibly non-empty repository), and error (signal an error if the repository specified already exists).

If use is specified, then any encoded id definitions will be examined and if any do not allow for 2^60 distinct strings and so will not work with next-encoded-upi-for-prefix, the conversion will fail and a warning will be printed. If the --force argument with value true is supplied, then the conversion will be done but none of the offending encoded id prefixes must be used again.

The Cluster Replication Manager page now displays statistics

These help users to monitor the state of the cluster. See the Managing clusters in AGWebView once created section in the Multi-master Replication document.

When adding a cluster instance in AGWebView, a progress log is displayed

When adding an instance in Webview you'll see that the log of actions is updated with progress reports describing what is being done. Also the AGWebView replication manager page has new columns and some columns have been renamed. See here for information on using AGWebView to manage clusters.

Rfe15465 - Disallow setting bulk-load-mode in replication instance

In a replication instance one cannot set bulk load mode since replication depends on the transaction logs being an accurate reflection of the changes to the repository and logging is disabled in bulk loading mode. Specifying the --bulk option to agtool load or clicking the Use bulk load mode checkbox when adding triples from an uploaded file in AGWebView will cause the load to fail.

Rfe15451 - Don't fail if unable to write to agload.log

If the current working directory is not writable agload would stop running with an error the first time it tries to write to the log file agload.log. Now this behavior has been changed to warn the user that it was unable to write to the log file and then continues processing. It continues logging to the terminal as it would normally do.

Rfe15426 - Expose and document the --parameter option for agtool load

agtool load now accepts the --parameter option for controlling the configuration of newly created repositories. See the --parameter option in the agtool load document for details.

Rfe15418 - Change StringTableCompression default to 'none'

AllegroGraph now in the default creates new repositories with string compression disabled. This results in faster out-of-the-box operation. String compression can be enabled by using the StringTableCompression directive in agraph.cfg. See the description of StringTableCompress in the Server Configuration and Control document for information.

Note that the string compression type can only been set when creating a new repository. The StringTableCompression parameter is further discussed here in the Performance Tuning document.

Rfe15190 - Remove --repl argument from agtool archive backup and agtool recover

The --repl argument for agtool archive backup and agtool recover is no longer present because it is no longer needed (whether or not a repository is a replication repository is now automatically determined).

Rfe14770 - Error message from agload loses most of the detail

When using agtool load the error messages signaled while loading triples were truncated. This is now corrected.

Rfe14389: AllegroGraph no longer supports Callimachus

AllegroGraph no longer supports Callimachus. Stores that were previously set up to integrate with Callimachus will open normally but they will no longer execute the Callimachus integration code.

Bug25087 - TempDir is not being used for placing temporary query files

Temporary query files were being placed in the repository's directory rather than in the location specified by the TempDir configuration parameter. This has been corrected.

Bug25075 - Bidirectional search can return bad paths

If there were many possible overlapping bidirectional paths between two nodes, AllegroGraph could return incorrect paths. This has been corrected.

Bug25102 - Subscript UPIs did not print correctly.

AllegroGraph was printing the prefix of a subscript UPIs twice. This has been corrected. Previously, they would print as 

<http://franz.com/ns/allegrograph/4.14/index#_http://franz.com/ns/allegrograph/4.14/index#_4>

Now they print as 

<http://franz.com/ns/allegrograph/4.14/index#_4>

Bug25062 - Fix uninformative error when running agraph-control as root.

When running agraph-control as root when there was no RunAs directive in agraph.cfg would result in the following uninformative error: 

Got error while executing plan: `nil' is not of the expected type  
`(array character (*))' for foreign type `(* :char)'

Now the error messages generated for no RunAs user and non-existent RunAs user, respectively, are: 

# bin/agraph-control --config lib/agraph.cfg start  
Running AllegroGraph as superuser is not recommended for security reasons.  
It is recommended that another less privileged user be used, specified  
via the `RunAs' directive in agraph.cfg.  
 
# bin/agraph-control --config lib/agraph.cfg start  
RunAs user `UserThatDoesNotExist' does not exist in the passwd database.  
 
Please run the AllegroGraph configuration script or adjust the `RunAs'  
directive in lib/agraph.cfg

HTTP API

Rfe15418 - Allow specifying string table compression method

Added a stringTableCompression parameter to the repository creation HTTP service.

SPARQL

Rfe15421 - Add control over duplicate triple reduction in SPARQL queries

AllegroGraph now has a new query option: enableDuplicateReduction which controls whether or not the SPARQL engine reduces the number of duplicate triples it processes. See SPARQL Query Options in the SPARQL Reference document.

If the store has no duplicate triples (based on subject, predicate, object, and graph) then this option has no effect.

SPARQL is defined on sets of triples (i.e., no duplicates) but AllegroGraph can store duplicates which can lead to duplicate rows of bindings returned by a query.

If this option is set to true, then AllegroGraph will ignore consecutive duplicate triples returned from the storage layer. Since the storage layer makes no guarentees on the order of triples it returns, this can lead to different results from the same query.

Note: Previous versions of AllegroGraph used duplicate reduction by default. This version turns if off by default. If your triple-store has duplicate triples, then this may change the results of your queries.

Rfe15419 - Include query modifiers when printing a SPARQL query plan

AllegroGraph now includes query modifiers like ORDER BY or LIMIT when it prints a query plan.

Rfe15391 - Warn when the variable HOST of a SERVICE clause is not bound

AllegroGraph now warns when the HOST variable of a SERVICE clause is unbound in the query.

For example, both of these queries will produce query warnings: 

# Query 1  
select * {  
 {  
   :myService :isAtURL ?url  
 } union {  
   service ?url { ?s ?p ?o }  
 }  
}  
 
# Query 2  
select * { service ?unknown { ?s ?p ?o } }

Rfe15354 - Improve handling of queries containing GRAPH and JOIN clauses

AllegroGraph will now handle queries involving GRAPH and JOIN clauses more efficiently.

Rfe15336 - Sanity check on JSON/XML data returned by SPARQL endpoint

If a SPARQL query includes a SERVICE call, the XML and JSON result data is now subject to more syntactic and semantic error checking. Nevertheless invalid result data from third parties might still lead to unexpected outcomes.

Rfe15273 - Add Javascript API for defining SPARQL extensions

AllegroGraph's server side Javascript engine now supports the following:

For details, see the Javascript documentation.

Bug25145 - Illegal keyword error when executing some queries

AllegroGraph could signal an Illegal Keyword error when executing some complex queries. This has been corrected.

Bug25113: SPARQL planner stopped optimizing certain queries

If a query has a FILTER like 

FILTER( ?var1 = ?var2 )

and it can be determined that both ?var1 and ?var2 are resources, then AllegroGraph can perform certain query optimizations. This feature was inadvertently broken in AllegroGraph 6.4 and has now been reinstated.

Bug25097 - Graph not in dataset warning signaled inappropriately

AllegroGraph v6.3.0 and following signal a query warning if the graph in a GRAPH clause is not in the dataset as in, for example, this query: 

select *  
from named <http://example.com#graph> {  
  graph <http://example.org#otherGraph> { ?s ?p ?o }  
}

AllegroGraph was signaling this warning more often than necessary. This has been corrected.

Bug25064 - GROUP BY expressions in a SUB-QUERY causes an error

AllegroGraph was signaling an error if a SPARQL query used GROUP BY expressions in a SUB-QUERY. This has been corrected. An example query that used to fail would be 

select * {  
  { select ?strWho (sum(?amount) as ?sum) {  
      ?who ?p ?amount .  
    } group by (str(?who) as ?strWho)  
  }  
}

Bug25057 - Values and OPTIONAL could lead to too many results

If a SPARQL query used a VALUES form inside the query and the VALUES form had only a single variable and a single binding for that variable and the query also used an OPTIONAL form that made use of the same variable, then AllegroGraph could return results with the variable unbound. This has been corrected.

As an example, AllegroGraph previously could have returned results with ?o2 unbound for the following query: 

SELECT ?s ?o1 ?o2 {  
  ?s ?p1 ?o1  
  OPTIONAL { ?s foaf:knows ?o2 }  
  VALUES (?o2) { (:b) }  
}

Bug25055 - Improve SPARQL parser error message for bad aggregation expression

AllegroGraph was signaling an error for bad aggregation expressions rather than indicating that the query failed to parse. For example, this query is invalid because it is illegal to GROUP BY an aggreagate: 

select (sum(?o) as ?sum) (sample(?s) as ?ss) {  
  ?s ?p ?o .  
} group by (sum(?o) as ?xxx) having (?xxx > 2)

AllegroGraph now signals a SPARQL parser error for queries like this.

Bug25034 - Catch additional SPARQL parse errors

SPARQL is defined such that repeated variables in the projection are ignored. Previously, AllegroGraph would include each repeated variable. Now, it will include only the first instance and will warn if the list includes repetition.

For example, this query: 

SELECT ?s ?g ?s { graph ?g { ?s ?p ?o } }

Will project only ?s and ?g and will warn that "The following variable is projected multiple times: ?s. Only the first projection will be included".

The variables in expressions and aggregation specifications may not overlap with other projected variables. AllegroGraph now catches errors like: 

SELECT ?o (str(?o) as ?o) {  
  ?s ?p ?o .  
}

or 

SELECT ?s (count(1) as ?s) {  
  ?s ?p ?o .  
} GROUP BY ?s

Previously, the above queries would have passed the parser.

AGWebView

Rfe15395 - Highlight all instances of the token under cursor in the query editor

AGWebView's SPARQL query editor now highlights any tokens that match the one currently under the cursor. This makes it easier to ensure that variable names are not mistyped.

Changes to the Lisp API

rfe15430 Use of next-encoded-upi-for-prefix in multi-master cluster instances

In order to use next-encoded-upi-for-prefix when the repository is a multi-master cluster instance, the template associated with the encoded id prefix must generate exactly 2^60 distinct strings. If it does not, the call to next-encoded-upi-for-prefix will signal an error. As noted just below, the "plain" will work as a template. See register-encoded-id-prefix.

Rfe15466 - Plain format encoded ids

register-encoded-id-prefix will treat the format argument of "plain" (a string) in this special way: The encoded id (the string after the @@) is a variable length integer in the range from 0 to (2^60 -1), much like blank nodes. This is a template suitable for use in multi-master cluster instances. See the Encoded IDs document.

rfe15430 Use of next-encoded-upi-for-prefix in multi-master cluster instances

In order to use next-encoded-upi-for-prefix when the repository is a multi-master cluster instance, the template associated with the encoded id prefix must generate exactly 2^60 distinct strings. If it does not, the call to next-encoded-upi-for-prefix will signal an error. As noted just above, the "plain" will work as a template. See register-encoded-id-prefix.

Rfe15379 - Remove in-line-data argument from the run-sparql

The in-line-data argument to run-sparql is no longer supported. If you need to execute the same basic query with different sets of BINDINGS, then use the VALUES form in your SPARQL query string.

Rfe15373 - Export peekable-cursors

The Lisp API now includes these new functions:

A peekable-cursor is like a regular cursor except cursor-peek can be used to see what cursor-next-row will return without modifying the state of the cursor. See the documentation for details.

Bug25119 - load-turtle not accepting a :base-uri arg in remote lisp client

The remote lisp client did not support the base-uri argument to load-turtle. This has been corrected.

Bug25070 - upi->value uses db when decoded encoded IDs

The upi->value function was using db to decode encoded IDs even when a specific value for db was passed into the function. This has been corrected.

Bug25043 - get-triples-nd-* functions were incompletely documented

The various nD get-triples functions (like get-triples-nd-within-bounding-box) return :part-not-found as a second return value if it can be determined that one of the search parameters is definitely not in the repository. This is now documented.

Bug23635: Make Lisp client :default-graph-uris keyword work with remote-triple-stores

SPARQL queries made against remote-triple-stores via run-sparql, that passed the :default-graph-uris keyword argument, would not return expected results. This has now been fixed.

Prolog

No significant changes.

Documentation

No significant changes.

nD Geospatial

Rfe13347 - Automatic nD datatype mapping is now on for new repositories

AllegroGraph now creates new repositories with automatic N-dimensional (nD) datatype mapping enabled. This means that adding triples with nD objects will add the necessary type mapping with no further intervention. See nD Geospatial Automation for details and a linke to further discussion in the geospatial examples document.

Bug25129: Bus error on geospatial search with a non-existing predicate

The bus error on the server happened when trying to obtain triples from polygon using predicate that was not previously added to the store.

Behaviour for obtaining triples from polygons was modified to properly handle this case.

AllegroGraph 6.4.0

AllegroGraph Server: General Changes

Rfe15302 - Remove support for using rapper as an external parser

The use-rapper argument to the AllegroGraph data import commands has been removed because AllegroGraph now supports all of the standard formats.

The rapper command line argument to agtool load has similarly been removed.

Rfe15219 - Add timeout and limit arguments to the SNA path-finding functions

The SNA path finding functions now have a timeout argument and a limit argument. The first specifies the number of seconds to execute the search whereas the second indicates that searching should stop once that many paths have been found.

The SNA path functions will return (as a second value) the status of the search. This will be either nil if the search was not interrupted, :timeout if the search reached the timeout, or :limit-reached if the limit on the number of paths was reached.

Note that the return format for the REST API to the SNA path functions is now versioned. The desired version if specified via a version parameter in the query string. If the version is 1, then the previous result format of a list of lists representing paths will be returned. Otherwise, the new format will be used. The new format consists of a JSON object with two keys: "paths" and "status". "paths" contains the list of paths and "status" contains the reason that the search completed. It will be one of "complete", "timeout", or "limit-reached".

Bug24980 - Turtle serializer escapes the PNAME_NS incorrectly

The Turtle serializer was escaping both the namespace portion and the local portion of a qualified name using the same logic. This was incorrect as the escaping for the two differ. The problem has been corrected.

HTTP API

No significant changes.

SPARQL

Rfe15337 - Have the NOW() SPARQL function include a timezone

The SPARQL NOW() function now returns dateTimes in GMT. Previously, the dateTimes had no explicit timezone.

Rfe15259 - Add a query option to limit the size of query log entries

AllegroGraph's SPARQL engine now truncates query log message to 512 characters by default. This limit can be changed by adding ":LINE_LENGTH" to the logQuery query option either in the AllegroGraph configuration file or on a per-query basis. For example, this PREFIX line will limit log lines to 100-characters: 

PREFIX franzOption_logQuery: <franz:yes:100>

Rfe15258 - Add maximumValuesCountForService query option

AllegroGraph uses the SPARQL VALUES clause to pass partial results to SPARQL endpoints. In general this can help the endpoint compute its results more efficiently but when there are many values the cost of transmitting the data can outweigh these benefits.

The maximumValuesCountForService provides a mechanism to limit the total number of VALUES sent.

Rfe15250 - Improve treatment of very large VALUES clauses

The query planner now handles large VALUES clauses significantly faster. In addition, the query executor now decides whether to probe or scan based on the number of VALUES and the expected number of rows that a cursor will need to traverse. These two changes can make some queries significantly faster.

Rfe11137: Support the TIMEZONE() and TZ() functions

AllegroGraph now supports the SPARQL 1.1. TIMEZONE() and TZ() functions.

Bug25003 - FILTERing on an expression like ( ! ?a = ?b ) caused an error

The above expression evaluates as (!?a) = ?b and AllegroGraph was not correctly handling the expression of the inner negation operator. This has been corrected.

Bug24985 - FILTER EXISTS and SUB-QUERY can lose solutions

If a FILTER EXISTS clause started with a sub-query then AllegroGraph could fail to find some solutions. This has been corrected.

Bug24657 - GRAPH filter can be applied to the wrong clause

If a graph variable appeared in the subject, predicate, or object position of a triple-pattern, it was possible for AllegroGraph to apply a GRAPH dataset constraint to it incorrectly. For example, AllegroGraph could have incorrectly determined that the ?g1 :predicate1 ?object pattern in the query below should be evaluated as if it was inside a GRAPH clause which could lead to incorrect results. 

select * {  
  GRAPH ?g1 { ?s1 ?p1 ?o1 } .  
  GRAPH ?g2 { ?s2 ?p2 ?o1 } .  
  ?g1 :predicate1 ?object .  
}

This has been corrected.

Bug24151 - Correct a SPARQL FILTER analysis issue

AllegroGraph's SPARQL engine would signal an error if a FILTER contained an expression like 

str( ?varOne ) = ?varTwo

This has been corrected.

Bug20593 - Support the SPARQL 1.1 BNODE( identifier ) function

AllegroGraph has long supported the BNODE() function with no arguments. It now also supports the version that takes a single plain literal or XSD string argument.

Bug24076 - Improve handling of DBPedia.org and other Virtuoso servers as SPARQL endpoints.

AllegroGraph works around an apparent problem with Virtuoso.

AGWebView

Rfe11480 - Added Shutdown instance operation to Repository Control section in AGWebView

See the desription of the repository page in the WebView document.

Bug24949 - Overview page broken for remote sessions

Opening a session to a single, remote store in WebView used to produce the following error message:

Loading failed: Service not supported in a session that does not wrap a single local store.

instead of the overview page. This has been corrected.

Bug24929 - Help messages appear out of view.

Help messages were often shown at the top of the Webview page, out of sight of the current page location. They will now be displayed in tooltips.

Changes to the Lisp API

Rfe15325: Make *db* a required thread binding

To help avoid accidental sharing of a repository connection between threads, each new thread will start with *db* bound to nil. Previously, *db* would retain its global value in new threads.

Given this sample code: 

(open-triple-store "test") ;; sets global value of *db*  
 
(mp:process-run-function "new thread"  
   (lambda ()  
     ;; The new thread wants its own connection to the repository  
     (open-triple-store "test")))

Prior to v6.4.0, the call to open-triple-store in "new thread" would overwrite the global value of *db*. In v6.4.0, "new thread" will have its own binding of *db* and the global value will not be affected.

Prolog

No significant changes.

Documentation

No significant changes.

nD Geospatial

No significant changes.

AllegroGraph 6.3.0

AllegroGraph Server: General Changes

Catalogs may no longer be named root or system.

The names root and system are reserved as catalog names. root interferes with the default catalog (which is referred to as the root catalog) and the system catalog is used for auditing and other system data. If you have catalogs named root or system, contact [email protected] if you have difficulty upgrading to 6.3.0.

'agtool archive' no longer accepts --catalog, catalog now part of repo name

The agtool archive program (see Backup and Restore) now specifies catalogs and repositories together using the catalog:repository format. The --catalog option to agtool archive is no longer accepted.

Rfe15210 - Log which user starts a session

When a session is started, AllegroGraph now logs the name of the user that started the session. (Although not documented, the AllegroGraph log has always said when a session was started and stopped.) A sample log message: 

[2017-09-21T15:59:48.028 p21266 back] Session on port 43704 started by user "test".

Rfe15194 - Support XQuery and XPath Math Functions

AllegroGraph now supports the following XPATH math functions

See http://www.w3.org/2005/xpath-functions/math/ for details.

Rfe15132 - agtool archive list can operate on backup directories

agtool archive list now can operate not only on single archive file but can be given backup directory as source. In that case it displays details about every repository inside backup.

Additionally it can be given the optional DB-IN-ARCHIVE argument to display details about single repository in ARCHIVE even if other repositories are present.

New option --summary allows agtool archive list to only list repositories inside ARCHIVE, without printing details about every one.

agtool archive is described in the Backup and Restore document.

Rfe12362 - CORS support

CORS (Cross-Origin Resource Sharing), if enabled, allows scripts run on a web page from one server to make HTTP requests to the (different) server where AllegroGraph is running. CORS is not enabled by default. You enable it with various donfiguration directives described in the CORS directives section of the Server Configuration and Control document.

Rfe12201 - Switching a repository between commit and no-commit modes

This now requires superuser privileges.

Bug24927 - Turtle serializer tried to escape capital A

The turtle serializer could try to escape the letter capital A which could lead to invalid output. This has been corrected.

Bug24910 - Unhelpful Turtle parser error message

Improved the error message the Turtle parser produced when the object of a triple was missing.

Bug24905 - Audit log does not display in AG 6.2.3

The Audit log display feature in AGWebView was inadvertently broken in release v6.2.3. This has been corrected.

Bug24842 - Custom services should not use user namespaces

Custom services were being executed in the context of the current user rather than in the context of the code that defined the service. This has been corrected.

Bug23757 - If a script file generates errors (warnings) while loading, don't start the session.

Previously, any errors or warnings that occurred when compiling a Lisp script were written to the AllegroGraph log file and the session would still start. Now, any problems are still written to the log file but the session will not start and the text of the problem(s) will be returned in the HTTP response.

HTTP API

Bug20845 - /version/info web service removed

The /version/info web service caused the server to report detailed internal information about the server and the machine on which the server was running. It was decided that the information was not in fact useful and could expose security vulnerabilities. The URL now returns 404.

SPARQL

Defining your own magic properties

AllegroGraph lets you define your own Magic Properties using the Lisp API. The Defining Magic Properties Tutorial describes how to do this and provides numerous simple examples.

Rfe15182 - All of AllegroGraph's query warnings are now documented.

See the Query Warnings section of the SPARQL Reference document.

Rfe15152 - Propagate impossible query conditions outward in the plan

When a query contains a triple pattern that cannot possibly match, it will mark the pattern as impossible. The impossible marking will propagate outward (e.g., from the pattern to the BGP to the enclosing JOIN and so on). This allows queries with typos or other errors to fail quickly.

Rfe15135 - Warn if any SPARQL type errors occur during query execution

SPARQL will now log a warning if any type errors are encountered during query execution. For example, it is an error to try and cast the string '1.23e4' to an integer because the lexical representation of an XSD integer consists of "a finite-length sequence of decimal digits (#x30-#x39) with an optional leading sign." (cf https://www.w3.org/TR/xmlschema-2/#integer). Therefore, a query like: 

select * { bind(xsd:integer('1.23e4') as ?int) }

will leave ?int unbound. Previously, this type error would have been surpressed. Now, AllegroGraph will issue a warn-sparql-type-errors warning.

Rfe15112 - Improve cancelQueryOnWarnings option

The cancelQueryOnWarnings query option now cancels queries immediately for most plan or query warnings. This option defaults to off but can be turned on by placing 

QueryOption cancelQueryOnWarnings=yes

in the AllegroGraph configuration or by prefixing a SPARQL query with the PREFIX 

PREFIX franzOption_cancelQueryOnWarnings: <franz:yes>

Rfe12249 - Improve magic predicates for Solr and MongoDB

The magic predicates that interface AllegroGraph's SPARQL engine with Solr and MongoDB have been improved. The three magic predicates:

can now take an optional second parameter in their list of subject arguments. This second parameter will be bound to the matching objects of any triples found by the search in the case of solr:matchID and to the associated linking identifier in the cases of solr:match and mongo:find. For example, the following query will bind ?s to the subjects found and ?text to the object: 

prefix solr: <http://franz.com/ns/allegrograph/4.5/solr/>  
select ?s ?text {  
  (?s ?text) solr:matchId 'boatswain' .  
}

Rfe11193 - Improvement performance of SPARQL expression compilation

The SPARQL query expression compiler is now approximately 45 times faster than before. This means that queries that use many expressions (e.g., in FILTERs, BIND, ORDER BY, etc.) will perform more efficiently.

Note that aggregation expressions still use the older and slower compiler.

Rfe11678 - Full-scan warning should take dataset into account

AllegroGraph signals a warning when a SPARQL query needs to perform a full scan and the store contains more than one million triples. AllegroGraph was incorrectly signaling this warning when the query was executed against a SPARQL dataset. This has been corrected.

Bug24898 - Fix problem with magic SNA centrality predicates and neighbor caches

Some queries that used AllegroGraph's SNA centrality magic predicates and neighbor caches could cause an error. This has been corrected.

Bug24861 - Sparql parser confused by "?o<='foo'^^<...> "

The SPARQL parser was incorrectly treating the inequality operator as the start of a URI. This has been corrected.

Bug24681 - Parsing should fail if a blank node label is used in more than one BGP

AllegroGraph did not signal a parsing error if a SPARQL query used the same blank node in more than one basic graph pattern (BGP). This has been corrected.

AGWebView

Rfe15198 - Index management page

An index management page has been added to AGWebView. The new page can be accessed from the Repository Overview page by following a link labeled 'Manage triple indices'. The list of indices has been removed from the overview page and the 'purge deleted triples' link has been moved to the index management page. See The Manage triple indices page for more information.

Rfe14563 - Repository reports

A set of reports describing disk usage and other repository properties has been added to WebView. The reports can be accessed through links on the repository overview page. See the Reports section in the Repository Overview page description for more information.

Rfe13419 - Add warmup triple-store to AGWebView

Add new option Warmup store in Repository Control section in repository overview page. See the description of the Repository Overview Page in the WebView document.

Rfe11915 - Creating freetext index prefills stop words with default ones.

The AGWebView dialog for creating a freetext index now starts with a default selection of stop words (rather than starting with no stop words and the option to add a default selection). See the Free-Text Indices page in the WebView document for more information.

Rfe11256: Import RDF statements directly.

It is now possible to import RDF statements directly by typing or pasting them into a text box in AG WebView. See the Load and Delete Data section of the Repository Overview page description.

Bug24824 - Spurious warning for ASK queries in AGWebView

AllegroGraph WebView was showing a query warning for ASK queries when the "Limit to 1000 results" checkbox was checked. This has been corrected.

Bug24480: "Ignore errors" option was ignored when loading triples from server file

The "Ignore errors" error handling option was not being honored when loading a server-side file using AG WebView. This has been fixed.

Bug23607 - Improve accuracy of query timing results in AGWebView

Previously, the timing results in AGWebView represented the time it took to find the first result. Now, it represents the time it takes to find all results. The total time to display may still be longer as it will also include the time it takes the web browser to render the returned data.

Changes to the Lisp API

Remove :plain datatype mapping

The :plain datatype mapping converted typed string literals into the equivalent plain literal. E.g., it would convert "bear"^^xsd:string into "bear". :plain mappings are no longer necessary because AllegroGraph handles typed strings more efficiently automatically. Mappings are specified with setf and datatype-mapping and predicate-mapping.

Note that any existing datatype or predicate mappings of type :plain will be automatically removed from the store.

Bug24857 - path-finding over HTTP fails when paths include literals

If an SNA path included typed literals, then a remote-triple-store would convert them into the wrong UPI type leading to UPI not in string-table errors. This has been corrected.

Prolog

No significant changes.

Documentation

No significant changes.

nD Geospatial

No significant changes.

User-visible changes in earlier releases

See Change History for user-visible changes to earlier releases.