Fix EXPLAIN AST output for single tuple in IN expression #36
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When an IN expression contains a single tuple literal, ClickHouse wraps it in a Function tuple node. This matches ClickHouse's behavior for queries like `SELECT (1, '') IN ((1, ''));`.
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When an IN expression contains a single tuple literal, ClickHouse wraps
it in a Function tuple node. This matches ClickHouse's behavior for
queries like
SELECT (1, '') IN ((1, ''));.