ibzib commented on a change in pull request #14035:
URL: https://github.com/apache/beam/pull/14035#discussion_r583044780
##########
File path:
sdks/java/extensions/sql/zetasql/src/main/java/org/apache/beam/sdk/extensions/sql/zetasql/translation/SqlOperators.java
##########
@@ -91,6 +92,12 @@
x -> createTypeFactory().createArrayType(x.getOperandType(0), -1),
new UdafImpl<>(new ArrayAgg.ArrayAggArray()));
+ public static final SqlOperator ARRAY_CONCAT_AGG_FN =
+ createUdafOperator(
+ "array_concat_agg",
+ x -> createTypeFactory().createArrayType(x.getOperandType(0), -1),
Review comment:
I'm pretty sure the problem is with this line here. The return type is
supposed to be `ARRAY<BIGINT>`, but the type returned here is
`ARRAY<ARRAY<BIGINT>>`. I'm guessing it's because `x.getOperandType(0)` is an
array type. Instead it should be the type of elements inside
`x.getOperandType(0)`. (I'm not sure exactly what the method is to get that,
but you should be able to figure it out using the debugger.)
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