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_r289582420
##########
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) {
+ 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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