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https://issues.apache.org/jira/browse/HIVE-261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12669835#action_12669835
]
Zheng Shao commented on HIVE-261:
---------------------------------
Antlr does not put the code in @after in every return statement.
{code}
./build/ql/gen-java/org/apache/hadoop/hive/ql/parse/HiveParser.java
public final explainStatement_return explainStatement() throws
RecognitionException {
explainStatement_return retval = new explainStatement_return();
retval.start = input.LT(1);
CommonTree root_0 = null;
Token isExtended=null;
Token KW_EXPLAIN5=null;
execStatement_return execStatement6 = null;
CommonTree isExtended_tree=null;
CommonTree KW_EXPLAIN5_tree=null;
RewriteRuleTokenStream stream_KW_EXTENDED=new
RewriteRuleTokenStream(adaptor,"token KW_EXTENDED");
RewriteRuleTokenStream stream_KW_EXPLAIN=new
RewriteRuleTokenStream(adaptor,"token KW_EXPLAIN");
RewriteRuleSubtreeStream stream_execStatement=new
RewriteRuleSubtreeStream(adaptor,"rule execStatement");
System.out.println("msgs size=" + msgs.size() + " explain statement");
msgs.push("explain statement");
try {
//
/data/users/zshao/sync/apache-trunk-HIVE-261/ql/src/java/org/apache/hadoop/hive/ql/parse/Hive.g:157:2:
( KW_EXPLAIN (isExtended= KW_EXTENDED )? execStatement -> ^( TOK_EXPLAI\
N execStatement ( $isExtended)? ) )
//
/data/users/zshao/sync/apache-trunk-HIVE-261/ql/src/java/org/apache/hadoop/hive/ql/parse/Hive.g:157:4:
KW_EXPLAIN (isExtended= KW_EXTENDED )? execStatement
{
KW_EXPLAIN5=(Token)input.LT(1);
match(input,KW_EXPLAIN,FOLLOW_KW_EXPLAIN_in_explainStatement448);
if (failed) return retval;
if ( backtracking==0 ) stream_KW_EXPLAIN.add(KW_EXPLAIN5);
//
/data/users/zshao/sync/apache-trunk-HIVE-261/ql/src/java/org/apache/hadoop/hive/ql/parse/Hive.g:157:15:
(isExtended= KW_EXTENDED )?
int alt2=2;
int LA2_0 = input.LA(1);
{code}
> union all query hangs
> ---------------------
>
> Key: HIVE-261
> URL: https://issues.apache.org/jira/browse/HIVE-261
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Hao Liu
>
> we have this query:
> SELECT a.u, b.id FROM (
> SELECT a1.u, a1.id as id FROM t_1 a1 WHERE a1.date = '2009-01-01' UNION ALL
> SELECT a2.u, a2.id as id FROM t_2 a2 WHERE a2.date = '2009-01-01' UNION ALL
> ...
> SELECT aN.u, aN.id as id FROM t_N an WHERE aN.date = '2009-01-01'
> ) a
> JOIN t b ON a.id = b.id WHERE b.date='2009-01-01'
> GROUP BY a.u, b.id
> When we union more than 20 tables, the query will hang. It looks like
> something wrong in the compiler.
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