Github user hsuanyi commented on a diff in the pull request:
https://github.com/apache/drill/pull/397#discussion_r56456528
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/DrillAvgVarianceConvertlet.java
---
@@ -40,7 +43,16 @@
public class DrillAvgVarianceConvertlet implements SqlRexConvertlet {
private final SqlAvgAggFunction.Subtype subtype;
- private static final DrillSqlOperator CastHighOp = new
DrillSqlOperator("CastHigh", 1, false);
+ private static final DrillSqlOperator CastHighOp = new
DrillSqlOperator("CastHigh", 1, false,
+ new SqlReturnTypeInference() {
+ @Override
+ public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
+ return TypeInferenceUtils.createCalciteTypeWithNullability(
+ opBinding.getTypeFactory(),
+ SqlTypeName.ANY,
--- End diff --
1.This is the legacy code. In theory, we should not create DrillSqlOperator
outside of DrillFunctionRegistry.
2. Convertlet follows after validation.
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