ClickHouse/dbms/Interpreters/AsteriskSemantic.h

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