ClickHouse/dbms/src/Interpreters/QueryAliasesVisitor.h

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#pragma once
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#include <Interpreters/Aliases.h>
#include <Interpreters/InDepthNodeVisitor.h>
namespace DB
{
class ASTSelectWithUnionQuery;
class ASTSubquery;
struct ASTTableExpression;
struct ASTArrayJoin;
/// Visits AST node to collect aliases.
class QueryAliasesMatcher
{
public:
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using Visitor = InDepthNodeVisitor<QueryAliasesMatcher, false>;
struct Data
{
Aliases & aliases;
};
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static void visit(ASTPtr & ast, Data & data);
static bool needChildVisit(ASTPtr & node, const ASTPtr & child);
private:
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static void visit(ASTSubquery & subquery, const ASTPtr & ast, Data & data);
static void visit(const ASTArrayJoin &, const ASTPtr & ast, Data & data);
static void visitOther(const ASTPtr & ast, Data & data);
};
/// Visits AST nodes and collect their aliases in one map (with links to source nodes).
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using QueryAliasesVisitor = QueryAliasesMatcher::Visitor;
}