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42 lines
1.6 KiB
C++
42 lines
1.6 KiB
C++
#pragma once
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#include <unordered_map>
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#include <Parsers/ASTAsterisk.h>
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#include <Parsers/ASTQualifiedAsterisk.h>
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#include <Parsers/ASTColumnsMatcher.h>
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namespace DB
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{
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struct AsteriskSemanticImpl
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{
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using RevertedAliases = std::unordered_map<String, std::vector<String>>;
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using RevertedAliasesPtr = std::shared_ptr<RevertedAliases>;
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RevertedAliasesPtr aliases; /// map of aliases that should be set in phase of * expanding.
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};
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struct AsteriskSemantic
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{
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using RevertedAliases = AsteriskSemanticImpl::RevertedAliases;
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using RevertedAliasesPtr = AsteriskSemanticImpl::RevertedAliasesPtr;
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static void setAliases(ASTAsterisk & node, const RevertedAliasesPtr & aliases) { node.semantic = makeSemantic(aliases); }
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static void setAliases(ASTQualifiedAsterisk & node, const RevertedAliasesPtr & aliases) { node.semantic = makeSemantic(aliases); }
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static void setAliases(ASTColumnsMatcher & node, const RevertedAliasesPtr & aliases) { node.semantic = makeSemantic(aliases); }
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static RevertedAliasesPtr getAliases(const ASTAsterisk & node) { return node.semantic ? node.semantic->aliases : nullptr; }
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static RevertedAliasesPtr getAliases(const ASTQualifiedAsterisk & node) { return node.semantic ? node.semantic->aliases : nullptr; }
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static RevertedAliasesPtr getAliases(const ASTColumnsMatcher & node) { return node.semantic ? node.semantic->aliases : nullptr; }
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private:
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static std::shared_ptr<AsteriskSemanticImpl> makeSemantic(const RevertedAliasesPtr & aliases)
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{
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return std::make_shared<AsteriskSemanticImpl>(AsteriskSemanticImpl{aliases});
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}
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};
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}
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