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https://issues.apache.org/jira/browse/HIVE-29466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18059085#comment-18059085
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Stamatis Zampetakis commented on HIVE-29466:
--------------------------------------------
This is very similar to HIVE-28222 but only pops up when the
hive.optimize.cte.suggester.class is used due to the presence of a
HiveTableSpool operator in the plan.
> Ambiguous table alias exception when using CTE suggester
> --------------------------------------------------------
>
> Key: HIVE-29466
> URL: https://issues.apache.org/jira/browse/HIVE-29466
> Project: Hive
> Issue Type: Task
> Components: CBO
> Reporter: Stamatis Zampetakis
> Assignee: Stamatis Zampetakis
> Priority: Major
>
> Queries with common table expressions may throw an ambiguity exception when a
> CTE suggester is in-use.
>
> {code:sql}
> create table t1 (key int, value int);
> set hive.optimize.cte.materialize.threshold=1;
> set
> hive.optimize.cte.suggester.class=org.apache.hadoop.hive.ql.optimizer.calcite.CommonTableExpressionIdentitySuggester;
> set hive.optimize.cte.materialize.full.aggregate.only=false;
> explain cbo
> select *
> from (select key from t1 where value = 10) a
> join (select key from t1 where value = 10) b;
> {code}
> Observe that the same expression "select key from t1 where value = 10"
> appears twice in the query and thus when
> {{hive.optimize.cte.suggester.class}} is used the optimizer will detect the
> equivalence and rewrite the query to use the CTE. However, the optimizer will
> assign the same alias (ie., "cte_suggestion_0") to both expressions causing
> the following exception:
> {noformat}
> org.apache.hadoop.hive.ql.parse.SemanticException: Line 0:-1 Ambiguous table
> alias 'cte_suggestion_0'
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.processTable(SemanticAnalyzer.java:1159)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.processJoin(SemanticAnalyzer.java:1671)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.doPhase1(SemanticAnalyzer.java:1896)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.doPhase1(SemanticAnalyzer.java:2111)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.doPhase1(SemanticAnalyzer.java:1746)
> at
> org.apache.hadoop.hive.ql.parse.CalcitePlanner.genOPTree(CalcitePlanner.java:632)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:13222)
> at
> org.apache.hadoop.hive.ql.parse.CalcitePlanner.analyzeInternal(CalcitePlanner.java:480)
> at
> org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:358)
> at
> org.apache.hadoop.hive.ql.parse.ExplainSemanticAnalyzer.analyzeInternal(ExplainSemanticAnalyzer.java:187)
> at
> org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:358)
> at org.apache.hadoop.hive.ql.Compiler.analyze(Compiler.java:224)
> at org.apache.hadoop.hive.ql.Compiler.compile(Compiler.java:109)
> at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:498)
> at org.apache.hadoop.hive.ql.Driver.compileInternal(Driver.java:450)
> at org.apache.hadoop.hive.ql.Driver.compileAndRespond(Driver.java:414)
> at org.apache.hadoop.hive.ql.Driver.compileAndRespond(Driver.java:408)
> at
> org.apache.hadoop.hive.ql.reexec.ReExecDriver.compileAndRespond(ReExecDriver.java:126)
> at
> org.apache.hadoop.hive.ql.reexec.ReExecDriver.run(ReExecDriver.java:234)
> at
> org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:259)
> at org.apache.hadoop.hive.cli.CliDriver.processCmd1(CliDriver.java:203)
> at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:129)
> at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:430)
> at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:358)
> at
> org.apache.hadoop.hive.ql.QTestUtil.executeClientInternal(QTestUtil.java:760)
> at org.apache.hadoop.hive.ql.QTestUtil.executeClient(QTestUtil.java:730)
> at
> org.apache.hadoop.hive.cli.control.CoreCliDriver.runTest(CoreCliDriver.java:115)
> at
> org.apache.hadoop.hive.cli.control.CliAdapter.runTest(CliAdapter.java:139)
> {noformat}
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