[
https://issues.apache.org/jira/browse/HIVE-26524?focusedWorklogId=811279&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-811279
]
ASF GitHub Bot logged work on HIVE-26524:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 22/Sep/22 15:25
Start Date: 22/Sep/22 15:25
Worklog Time Spent: 10m
Work Description: kasakrisz commented on code in PR #3588:
URL: https://github.com/apache/hive/pull/3588#discussion_r977796570
##########
ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/translator/ASTConverter.java:
##########
@@ -121,7 +127,83 @@ public static ASTNode convert(final RelNode relNode,
List<FieldSchema> resultSch
return c.convert();
}
+ // TOK_QUERY
+ // TOK_INSERT
+ // TOK_DESTINATION
+ // TOK_DIR
+ // TOK_TMP_FILE
+ // TOK_SELECT
+ // TOK_SELEXPR
+ // TOK_FUNCTION
+ // TOK_<type>
+ // TOK_NULL
+ // alias0
+ // ...
+ // TOK_SELEXPR
+ // TOK_FUNCTION
+ // TOK_<type>
+ // TOK_NULL
+ // aliasn
+ // TOK_LIMIT
+ // 0
+ // 0
+ private static ASTNode emptyPlan(RelDataType dataType) {
Review Comment:
Added UT.
Issue Time Tracking
-------------------
Worklog Id: (was: 811279)
Time Spent: 3h 10m (was: 3h)
> Use Calcite to remove sections of a query plan known never produces rows
> ------------------------------------------------------------------------
>
> Key: HIVE-26524
> URL: https://issues.apache.org/jira/browse/HIVE-26524
> Project: Hive
> Issue Type: Improvement
> Components: CBO
> Reporter: Krisztian Kasa
> Assignee: Krisztian Kasa
> Priority: Major
> Labels: pull-request-available
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
> Calcite has a set of rules to remove sections of a query plan known never
> produces any rows. In some cases the whole plan can be removed. Such plans
> are represented with a single {{Values}} operators with no tuples. ex.:
> {code:java}
> select y + 1 from (select a1 y, b1 z from t1 where b1 > 10) q WHERE 1=0
> {code}
> {code:java}
> HiveValues(tuples=[[]])
> {code}
> Other cases when plan has outer join or set operators some branches can be
> replaced with empty values moving forward in some cases the join/set operator
> can be removed
> {code:java}
> select a2, b2 from t2 where 1=0
> union
> select a1, b1 from t1
> {code}
> {code:java}
> HiveAggregate(group=[{0, 1}])
> HiveTableScan(table=[[default, t1]], table:alias=[t1])
> {code}
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
