ClickHouse

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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 2021-01-06 22:55:01 +00:00			`\N`
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