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https://github.com/ClickHouse/ClickHouse.git
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87 lines
2.5 KiB
C++
87 lines
2.5 KiB
C++
#pragma once
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#include <Parsers/IAST.h>
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#include <Parsers/ASTFunctionWithKeyValueArguments.h>
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#include <Parsers/ASTLiteral.h>
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#include <Parsers/ASTExpressionList.h>
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namespace DB
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{
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/// AST for external dictionary lifetime:
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/// lifetime(min 10 max 100)
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class ASTDictionaryLifetime : public IAST
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{
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public:
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UInt64 min_sec = 0;
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UInt64 max_sec = 0;
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String getID(char) const override { return "Dictionary lifetime"; }
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ASTPtr clone() const override;
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void formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override;
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};
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/// AST for external dictionary layout. Has name and contain single parameter
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/// layout(type()) or layout(type(param value))
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class ASTDictionaryLayout : public IAST
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{
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using KeyValue = std::pair<std::string, ASTLiteral *>;
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public:
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/// flat, cache, hashed, etc.
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String layout_type;
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/// optional parameter (size_in_cells)
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std::optional<KeyValue> parameter;
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String getID(char) const override { return "Dictionary layout"; }
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ASTPtr clone() const override;
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void formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override;
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};
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/// AST for external range-hashed dictionary
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/// Range bounded with two attributes from minimum to maximum
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/// RANGE(min attr1 max attr2)
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class ASTDictionaryRange : public IAST
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{
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public:
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String min_attr_name;
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String max_attr_name;
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String getID(char) const override { return "Dictionary range"; }
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ASTPtr clone() const override;
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void formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override;
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};
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/// AST contains all parts of external dictionary definition except attributes
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class ASTDictionary : public IAST
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{
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public:
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/// Dictionary keys -- one or more
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ASTExpressionList * primary_key;
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/// Dictionary external source, doesn't have own AST, because
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/// source parameters absolutely different for different sources
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ASTFunctionWithKeyValueArguments * source;
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/// Lifetime of dictionary (required part)
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ASTDictionaryLifetime * lifetime;
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/// Layout of dictionary (required part)
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ASTDictionaryLayout * layout;
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/// Range for dictionary (only for range-hashed dictionaries)
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ASTDictionaryRange * range;
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String getID(char) const override { return "Dictionary definition"; }
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ASTPtr clone() const override;
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void formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override;
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};
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}
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