FAQ
Author: gunther
Date: Sat Sep 20 01:20:26 2014
New Revision: 1626377

URL: http://svn.apache.org/r1626377
Log:
HIVE-8198: [CBO] Handle case where top level schema contains repeated alias (Ashutosh Chauhan via Gunther Hagleitner)

Modified:
     hive/branches/cbo/ql/src/java/org/apache/hadoop/hive/ql/optimizer/optiq/translator/DerivedTableInjector.java

Modified: hive/branches/cbo/ql/src/java/org/apache/hadoop/hive/ql/optimizer/optiq/translator/DerivedTableInjector.java
URL: http://svn.apache.org/viewvc/hive/branches/cbo/ql/src/java/org/apache/hadoop/hive/ql/optimizer/optiq/translator/DerivedTableInjector.java?rev=1626377&r1=1626376&r2=1626377&view=diff
==============================================================================
--- hive/branches/cbo/ql/src/java/org/apache/hadoop/hive/ql/optimizer/optiq/translator/DerivedTableInjector.java (original)
+++ hive/branches/cbo/ql/src/java/org/apache/hadoop/hive/ql/optimizer/optiq/translator/DerivedTableInjector.java Sat Sep 20 01:20:26 2014
@@ -138,7 +138,12 @@ public class DerivedTableInjector {
      // (limit)?(OB)?(ProjectRelBase)....
      List<RexNode> rootChildExps = originalProjRel.getChildExps();
      if (resultSchema.size() != rootChildExps.size()) {
- throw new RuntimeException("Result Schema didn't match Optiq Optimized Op Tree Schema");
+ // this is a bug in Hive where for queries like select key,value,value
+ // convertRowSchemaToResultSetSchema() only returns schema containing key,value
+ // Underlying issue is much deeper because it seems like RowResolver itself doesnt have
+ // those mappings. see limit_pushdown.q & limit_pushdown_negative.q
+ // Till Hive issue is fixed, disable CBO for such queries.
+ throw new OptiqSemanticException("Result Schema didn't match Optiq Optimized Op Tree Schema");
      }

      List<String> newSelAliases = new ArrayList<String>();

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