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43 lines
1.0 KiB
C++
43 lines
1.0 KiB
C++
#pragma once
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#include <Core/Field.h>
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#include <Common/FieldVisitors.h>
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#include <Parsers/ASTWithAlias.h>
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#include <Parsers/TokenIterator.h>
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#include <optional>
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namespace DB
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{
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/** Literal (atomic) - number, string, NULL
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*/
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class ASTLiteral : public ASTWithAlias
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{
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public:
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Field value;
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/// For ConstantExpressionTemplate
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std::optional<TokenIterator> begin;
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std::optional<TokenIterator> end;
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ASTLiteral(const Field & value_) : value(value_) {}
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/** Get the text that identifies this element. */
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String getID(char delim) const override { return "Literal" + (delim + applyVisitor(FieldVisitorDump(), value)); }
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ASTPtr clone() const override { return std::make_shared<ASTLiteral>(*this); }
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void updateTreeHashImpl(SipHash & hash_state) const override;
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protected:
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void formatImplWithoutAlias(const FormatSettings & settings, FormatState &, FormatStateStacked) const override
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{
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settings.ostr << applyVisitor(FieldVisitorToString(), value);
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}
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void appendColumnNameImpl(WriteBuffer & ostr) const override;
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};
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}
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