[teiid-issues] [JBoss JIRA] (TEIID-3846) Wrong alias rewriting in subqueries

[Salvatore R (JIRA)]

Salvatore R created TEIID-3846:
----------------------------------

             Summary: Wrong alias rewriting in subqueries
                 Key: TEIID-3846
                 URL: https://issues.jboss.org/browse/TEIID-3846
             Project: Teiid
          Issue Type: Bug
            Reporter: Salvatore R
            Assignee: Steven Hawkins


I defined two tables in PostgreSQL (but it's reproducible also in other databases like MySQL, for example) as follows:
{code:sql}
CREATE TABLE test_a
(
  a integer,
  b integer
);
CREATE TABLE test_b
(
  b integer,
  c integer
);
{code}

Running this query:
{code:sql}
SELECT
        *
    FROM
        ( SELECT
			( SELECT x.a FROM pg.test_a AS x WHERE x.b = g_0.c ) AS c_2
            FROM
                 pg.test_b AS g_0                
) AS v_0
{code}

I get the following exception:
{code:sql}
13:11:30,073 WARN  [org.teiid.CONNECTOR] (Worker5_QueryProcessorQueue50) 1iTDksSjXt1V Connector worker process failed for atomic-request=1iTDksSjXt1V.16.1.11: org.teiid.translator.jdbc.JDBCExecutionException: 0 TEIID11008:TEIID11004 Error executing statement(s): [Prepared Values: [] SQL: SELECT v_0.c_0 FROM (SELECT (SELECT g_1."a" FROM "public"."test_a" AS g_1 WHERE g_1."b" = g_1."c") AS c_0 FROM "public"."test_b" AS g_0) AS v_0]
        at org.teiid.translator.jdbc.JDBCQueryExecution.execute(JDBCQueryExecution.java:131) [translator-jdbc-8.12.0.CR1.jar:8.12.0.CR1]
        at org.teiid.dqp.internal.datamgr.ConnectorWorkItem.execute(ConnectorWorkItem.java:349)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.7.0_67]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) [rt.jar:1.7.0_67]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_67]
        at java.lang.reflect.Method.invoke(Method.java:606) [rt.jar:1.7.0_67]
        at org.teiid.dqp.internal.datamgr.ConnectorManager$1.invoke(ConnectorManager.java:211)
        at com.sun.proxy.$Proxy47.execute(Unknown Source)
        at org.teiid.dqp.internal.process.DataTierTupleSource.getResults(DataTierTupleSource.java:298)
        at org.teiid.dqp.internal.process.DataTierTupleSource$1.call(DataTierTupleSource.java:110)
        at org.teiid.dqp.internal.process.DataTierTupleSource$1.call(DataTierTupleSource.java:107)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262) [rt.jar:1.7.0_67]
        at org.teiid.dqp.internal.process.FutureWork.run(FutureWork.java:58)
        at org.teiid.dqp.internal.process.DQPWorkContext.runInContext(DQPWorkContext.java:276)
        at org.teiid.dqp.internal.process.ThreadReuseExecutor$RunnableWrapper.run(ThreadReuseExecutor.java:119)
        at org.teiid.dqp.internal.process.ThreadReuseExecutor$3.run(ThreadReuseExecutor.java:210)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_67]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_67]
        at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_67]
Caused by: org.postgresql.util.PSQLException: ERROR: column g_1.c does not exist
  Position: 91
        at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2157)
        at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1886)
        at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:255)
        at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:555)
        at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:417)
        at org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:302)
        at org.jboss.jca.adapters.jdbc.WrappedPreparedStatement.executeQuery(WrappedPreparedStatement.java:462)
        at org.teiid.translator.jdbc.JDBCQueryExecution.execute(JDBCQueryExecution.java:123) [translator-jdbc-8.12.0.CR1.jar:8.12.0.CR1]
        ... 18 more
{code}

It seems that the problem is related to the alias "g_0" used for the source table "pg.test_b". In fact, if a different alias is used, the query runs without errors:
{code:sql}
SELECT
        *
    FROM
        ( SELECT
			( SELECT x.a FROM pg.test_a AS x WHERE x.b = y.c ) AS c_2
            FROM
                 pg.test_b AS y                
) AS v_0
{code}



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