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https://issues.apache.org/jira/browse/OPENJPA-1781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12906207#action_12906207
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Kai Feng Zhang commented on OPENJPA-1781:
-----------------------------------------
Hi Catalina,
Thank you very much for this detailed reply.
Btw, what does SQL pushdown mean? Thanks.
> OpenJPA 2.0 supports count(*) or not?
> -------------------------------------
>
> Key: OPENJPA-1781
> URL: https://issues.apache.org/jira/browse/OPENJPA-1781
> Project: OpenJPA
> Issue Type: Bug
> Components: query
> Affects Versions: 2.0.0
> Environment: JDK 1.6, OpenJPA 2.0, Shindig 2.0
> Reporter: Kai Feng Zhang
> Priority: Critical
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> Today I encountered a jpql parse exception thrown from openjpa 2.0. I
> searched here and found some links talking about count(*), but seems 2.0
> still has such issue.
> https://issues.apache.org/jira/browse/OPENJPA-566
> https://issues.apache.org/jira/browse/OPENJPA-1440
> My select statement is: "select count(*) from PersonDb p where p.objectId in
> (select f.friend.objectId from PersonDb p, FriendDb f where p.objectId =
> f.person.objectId and p.id in (?1)) ".
> In JPQLParser.java, it will parse this jpql, and then throw exception:
>
> public Object parse(String ql, ExpressionStoreQuery query) {
> if (query.getContext().getParameterDeclaration() != null)
> throw new UserException(_loc.get("param-decs-invalid"));
> try {
> return new JPQLExpressionBuilder.ParsedJPQL(ql);
> } catch (ParseException e) {
> throw new ParseException(_loc.get("jpql-parse-error",
> ql, e.getMessage()).getMessage(), e);
> }
> }
> Exception stack is here:
> <openjpa-2.0.0-r422266:935683 nonfatal user error>
> org.apache.openjpa.persistence.ArgumentException: "Encountered "count ( *" at
> character 8, but expected: ["(", "+", "-", ":", "?", "ABS", "AVG", "CASE",
> "COALESCE", "CONCAT", "COUNT", "CURRENT_DATE", "CURRENT_TIME",
> "CURRENT_TIMESTAMP", "DISTINCT", "ENTRY", "INDEX", "KEY", "LENGTH", "LOCATE",
> "LOWER", "MAX", "MIN", "MOD", "NEW", "NULLIF", "OBJECT", "SIZE", "SQRT",
> "SUBSTRING", "SUM", "TRIM", "TYPE", "UPPER", "VALUE", <BOOLEAN_LITERAL>,
> <DATE_LITERAL>, <DECIMAL_LITERAL>, <IDENTIFIER>, <INTEGER_LITERAL>,
> <STRING_LITERAL>, <TIMESTAMP_LITERAL>, <TIME_LITERAL>]." while parsing JPQL
> "select count(*) from PersonDb p where p.objectId in (select
> f.friend.objectId from PersonDb p, FriendDb f where p.objectId =
> f.person.objectId and p.id in (?1))". See nested stack trace for original
> parse error.
> at org.apache.openjpa.kernel.jpql.JPQLParser.parse(JPQLParser.java:51)
> at
> org.apache.openjpa.kernel.ExpressionStoreQuery.newCompilation(ExpressionStoreQuery.java:150)
> at
> org.apache.openjpa.kernel.QueryImpl.newCompilation(QueryImpl.java:670)
> at
> org.apache.openjpa.kernel.QueryImpl.compilationFromCache(QueryImpl.java:652)
> at
> org.apache.openjpa.kernel.QueryImpl.compileForCompilation(QueryImpl.java:618)
> at
> org.apache.openjpa.kernel.QueryImpl.compileForExecutor(QueryImpl.java:680)
> at org.apache.openjpa.kernel.QueryImpl.compile(QueryImpl.java:587)
> at
> org.apache.openjpa.persistence.EntityManagerImpl.createQuery(EntityManagerImpl.java:985)
> at
> org.apache.openjpa.persistence.EntityManagerImpl.createQuery(EntityManagerImpl.java:971)
> at
> org.apache.openjpa.persistence.EntityManagerImpl.createQuery(EntityManagerImpl.java:100)
> at
> org.apache.shindig.social.opensocial.jpa.spi.JPQLUtils.createQuery(JPQLUtils.java:112)
> at
> org.apache.shindig.social.opensocial.jpa.spi.JPQLUtils.getTotalResults(JPQLUtils.java:98)
> at
> org.apache.shindig.social.opensocial.jpa.spi.PersonServiceDb.getPeople(PersonServiceDb.java:135)
> at
> org.apache.shindig.social.opensocial.service.PersonHandler.get(PersonHandler.java:86)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.apache.shindig.protocol.DefaultHandlerRegistry$MethodCaller.call(DefaultHandlerRegistry.java:483)
> at
> org.apache.shindig.protocol.DefaultHandlerRegistry$RpcInvocationHandler.execute(DefaultHandlerRegistry.java:301)
> at
> org.apache.shindig.protocol.DefaultHandlerRegistry$RpcInvocationWrapper.execute(DefaultHandlerRegistry.java:325)
> at
> org.apache.shindig.protocol.JsonRpcServlet.dispatchBatch(JsonRpcServlet.java:185)
> at
> org.apache.shindig.protocol.JsonRpcServlet.service(JsonRpcServlet.java:130)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
> at
> org.apache.shindig.auth.AuthenticationServletFilter.callChain(AuthenticationServletFilter.java:125)
> at
> org.apache.shindig.auth.AuthenticationServletFilter.doFilter(AuthenticationServletFilter.java:88)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
> at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
> at
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
> at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
> at
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
> at
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
> at
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
> at
> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
> at
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
> at
> org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
> at java.lang.Thread.run(Thread.java:619)
> Caused by: <openjpa-2.0.0-r422266:935683 nonfatal user error>
> org.apache.openjpa.persistence.ArgumentException: Encountered "count ( *" at
> character 8, but expected: ["(", "+", "-", ":", "?", "ABS", "AVG", "CASE",
> "COALESCE", "CONCAT", "COUNT", "CURRENT_DATE", "CURRENT_TIME",
> "CURRENT_TIMESTAMP", "DISTINCT", "ENTRY", "INDEX", "KEY", "LENGTH", "LOCATE",
> "LOWER", "MAX", "MIN", "MOD", "NEW", "NULLIF", "OBJECT", "SIZE", "SQRT",
> "SUBSTRING", "SUM", "TRIM", "TYPE", "UPPER", "VALUE", <BOOLEAN_LITERAL>,
> <DATE_LITERAL>, <DECIMAL_LITERAL>, <IDENTIFIER>, <INTEGER_LITERAL>,
> <STRING_LITERAL>, <TIMESTAMP_LITERAL>, <TIME_LITERAL>].
> at
> org.apache.openjpa.kernel.jpql.JPQL.generateParseException(JPQL.java:13087)
> at org.apache.openjpa.kernel.jpql.JPQL.jj_consume_token(JPQL.java:12961)
> at org.apache.openjpa.kernel.jpql.JPQL.select_expression(JPQL.java:1001)
> at org.apache.openjpa.kernel.jpql.JPQL.select_expressions(JPQL.java:930)
> at org.apache.openjpa.kernel.jpql.JPQL.select_clause(JPQL.java:865)
> at org.apache.openjpa.kernel.jpql.JPQL.select_statement(JPQL.java:87)
> at org.apache.openjpa.kernel.jpql.JPQL.parseQuery(JPQL.java:63)
> at
> org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder$ParsedJPQL.parse(JPQLExpressionBuilder.java:2371)
> at
> org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder$ParsedJPQL.<init>(JPQLExpressionBuilder.java:2358)
> at org.apache.openjpa.kernel.jpql.JPQLParser.parse(JPQLParser.java:49)
> ... 39 more
>
> Can you please tell me if openjpa support count(*) or not, or if not then
> will fix the method in JPQLUtil.java?
> Thank you.
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