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43 lines
1.4 KiB
C++
43 lines
1.4 KiB
C++
#pragma once
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#include <Core/Names.h>
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#include <Parsers/IAST.h>
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#include <Common/SettingsChanges.h>
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namespace DB
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{
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constexpr char QUERY_PARAMETER_NAME_PREFIX[] = "param_";
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/** SET query
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*/
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class ASTSetQuery : public IAST
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{
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public:
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bool is_standalone = true; /// If false, this AST is a part of another query, such as SELECT.
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/// To support overriding certain settings in a **subquery**, we add a ASTSetQuery with Settings to all subqueries, containing
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/// the list of all settings that affect them (specifically or globally to the whole query).
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/// We use `print_in_format` to avoid printing these nodes when they were left unchanged from the parent copy
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/// See more: https://github.com/ClickHouse/ClickHouse/issues/38895
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bool print_in_format = true;
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SettingsChanges changes;
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/// settings that will be reset to default value
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std::vector<String> default_settings;
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NameToNameMap query_parameters;
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/** Get the text that identifies this element. */
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String getID(char) const override { return "Set"; }
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ASTPtr clone() const override { return std::make_shared<ASTSetQuery>(*this); }
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void formatImpl(const FormatSettings & format, FormatState &, FormatStateStacked) const override;
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void updateTreeHashImpl(SipHash & hash_state) const override;
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QueryKind getQueryKind() const override { return QueryKind::Set; }
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};
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}
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