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38 lines
961 B
C++
38 lines
961 B
C++
#pragma once
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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 ASTSelectQuery;
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struct SettingChange;
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class SettingsChanges;
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/// Pushdown SETTINGS clause to the INSERT from the SELECT query:
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/// (since SETTINGS after SELECT will be parsed by the SELECT parser.)
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///
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/// NOTE: INSERT ... SELECT ... FORMAT Null SETTINGS max_insert_threads=10 works even w/o push down,
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/// since ParserInsertQuery does not use ParserQueryWithOutput.
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class InsertQuerySettingsPushDownMatcher
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{
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public:
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using Visitor = InDepthNodeVisitor<InsertQuerySettingsPushDownMatcher, true>;
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struct Data
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{
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ASTPtr & insert_settings_ast;
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};
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static bool needChildVisit(ASTPtr & node, const ASTPtr & child);
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static void visit(ASTPtr & ast, Data & data);
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private:
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static void visit(ASTSelectQuery &, ASTPtr &, Data &);
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};
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using InsertQuerySettingsPushDownVisitor = InsertQuerySettingsPushDownMatcher::Visitor;
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}
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