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40 lines
1.1 KiB
C++
40 lines
1.1 KiB
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 that goes after FORMAT to the SELECT query:
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/// (since settings after FORMAT parsed separately not in the ParserSelectQuery but in ParserQueryWithOutput)
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///
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/// SELECT 1 FORMAT Null SETTINGS max_block_size = 1 ->
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/// SELECT 1 SETTINGS max_block_size = 1 FORMAT Null SETTINGS max_block_size = 1
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///
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/// Otherwise settings after FORMAT will not be applied.
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class QueryWithOutputSettingsPushDownMatcher
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{
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public:
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using Visitor = InDepthNodeVisitor<QueryWithOutputSettingsPushDownMatcher, true>;
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struct Data
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{
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const ASTPtr & 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 QueryWithOutputSettingsPushDownVisitor = QueryWithOutputSettingsPushDownMatcher::Visitor;
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}
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