ClickHouse/tests/queries/0_stateless/01642_if_nullable_regression.reference
Azat Khuzhin fdcfacda60 Fix *If combinator with Nullable types
sumIf(Nullable()) and similar unary functions (unary w/o If combinator)
was working incorrectly, since it returns "sum" from the getName()
helper, and so distributed query processing fails.

The problem is in the optimization in
AggregateFunctionIfNullUnary::add() for the unary functions. It pass
only one column to write result to, instead of all passed arguments +
result columns.
While AggregateFunctionIf::add() assumes that it accepts arguments  +
result columns, and use last column as a result.

Introduced-in: #16610
Fixes: #18210
2021-01-07 03:09:13 +03:00

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