Stamatis Zampetakis created HIVE-29466:
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Summary: 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
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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