t3rmin4t0r commented on a change in pull request #656: HIVE-21742 :
Vectorization: CASE result type casting
URL: https://github.com/apache/hive/pull/656#discussion_r289582362
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/parse/TypeCheckProcFactory.java
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@@ -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) {
Review comment:
Why is this a special case?
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