[
https://issues.apache.org/jira/browse/HIVE-21742?focusedWorklogId=252141&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-252141
]
ASF GitHub Bot logged work on HIVE-21742:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 01/Jun/19 00:18
Start Date: 01/Jun/19 00:18
Worklog Time Spent: 10m
Work Description: t3rmin4t0r commented on pull request #656: HIVE-21742 :
Vectorization: CASE result type casting
URL: https://github.com/apache/hive/pull/656#discussion_r289582420
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/parse/TypeCheckProcFactory.java
##########
@@ -1274,6 +1274,40 @@ protected ExprNodeDesc
getXpathOrFuncExprNodeDesc(ASTNode expr,
children);
}
+ // introduce cast for expressions which are of different type than
parent WHEN expr's type
+ // this is done so that vectorization is able to vectorize
appropriately
+ if (genericUDF instanceof GenericUDFWhen && desc instanceof
ExprNodeGenericFuncDesc) {
+ String castTypeName = desc.getTypeInfo().getTypeName();
+ if (desc.getTypeInfo() instanceof DecimalTypeInfo) {
+ castTypeName = serdeConstants.DECIMAL_TYPE_NAME;
+ }
+ FunctionInfo castFun =
FunctionRegistry.getFunctionInfo(castTypeName);
+
+ String whenTypeName = desc.getTypeInfo().getTypeName();
+ List<ExprNodeDesc> updatedChildren = new ArrayList<>();
+ if (castFun != null) {
+ GenericUDF castUDF = castFun.getGenericUDF();
+ if (desc.getTypeInfo() instanceof DecimalTypeInfo || desc
+ .getTypeInfo() instanceof VarcharTypeInfo || desc
+ .getTypeInfo() instanceof CharTypeInfo || desc
+ .getTypeInfo() instanceof TimestampLocalTZTypeInfo) {
+ ((SettableUDF) castUDF).setTypeInfo(desc.getTypeInfo());
Review comment:
Special case for varchar(1) -> varchar(2) ?
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Issue Time Tracking
-------------------
Worklog Id: (was: 252141)
Time Spent: 0.5h (was: 20m)
> Vectorization: CASE result type casting
> ---------------------------------------
>
> Key: HIVE-21742
> URL: https://issues.apache.org/jira/browse/HIVE-21742
> Project: Hive
> Issue Type: Bug
> Components: Logical Optimizer, Vectorization
> Affects Versions: 3.1.1
> Reporter: Gopal V
> Assignee: Vineet Garg
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-21742.1.patch, HIVE-21742.2.patch,
> HIVE-21742.3.patch
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> {code}
> create temporary table foo(q548284 int);
> insert into foo values(1),(2),(3),(4),(5),(6);
> select q548284, CASE WHEN ((q548284 = 1)) THEN (0.2) WHEN ((q548284 = 2))
> THEN (0.4) WHEN ((q548284 = 3)) THEN (0.6) WHEN ((q548284 = 4)) THEN (0.8)
> WHEN ((q548284 = 5)) THEN (1) ELSE (null) END from foo order by q548284 limit
> 1;
> {code}
> Fails with
> {code}
> Caused by: java.lang.ClassCastException:
> org.apache.hadoop.hive.ql.exec.vector.LongColumnVector cannot be cast to
> org.apache.hadoop.hive.ql.exec.vector.DecimalColumnVector
> at
> org.apache.hadoop.hive.ql.exec.vector.DecimalColumnVector.setElement(DecimalColumnVector.java:130)
> at
> org.apache.hadoop.hive.ql.exec.vector.expressions.IfExprColumnNull.evaluate(IfExprColumnNull.java:101)
> {code}
> This gets fixed if the case return of (1) is turned into a (1.0).
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