2021-02-14 11:09:36 +00:00
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#pragma once
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2021-11-26 17:21:54 +00:00
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#include <Parsers/IAST_fwd.h>
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2021-02-14 11:09:36 +00:00
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namespace DB
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{
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2022-09-19 14:03:22 +00:00
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/// Rewrite function names to their canonical forms.
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/// For example, rewrite (1) to (2)
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/// (1) SELECT suM(1), AVG(2);
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/// (2) SELECT sum(1), avg(2);
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///
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/// It's used to help projection query analysis matching function nodes by their canonical names.
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/// See the comment of ActionsDAG::foldActionsByProjection for details.
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2021-02-14 11:09:36 +00:00
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struct FunctionNameNormalizer
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{
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2021-02-14 12:53:50 +00:00
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static void visit(IAST *);
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2021-02-14 11:09:36 +00:00
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};
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}
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