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31 lines
694 B
C++
31 lines
694 B
C++
#pragma once
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#include <unordered_set>
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#include <Parsers/IAST.h>
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#include <Interpreters/InDepthNodeVisitor.h>
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namespace DB
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{
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class ASTFunction;
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/// Rewrite 'sum(if())' and 'sumIf' functions to counIf.
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/// sumIf(1, cond) -> countIf(1, cond)
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/// sum(if(cond, 1, 0)) -> countIf(cond)
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/// sum(if(cond, 0, 1)) -> countIf(not(cond))
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class RewriteSumIfFunctionMatcher
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{
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public:
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struct Data
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{
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};
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static void visit(ASTPtr & ast, Data &);
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static void visit(const ASTFunction &, ASTPtr & ast, Data &);
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static bool needChildVisit(const ASTPtr &, const ASTPtr &) { return true; }
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};
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using RewriteSumIfFunctionVisitor = InDepthNodeVisitor<RewriteSumIfFunctionMatcher, false>;
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}
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