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#pragma once
#include <Interpreters/Aliases.h>
#include <Interpreters/InDepthNodeVisitor.h>
namespace DB
{
class ASTFunction;
/** Visits ASTFunction nodes and if it is used defined function replace it with function body.
* Example:
*
* CREATE FUNCTION test_function AS a -> a + 1;
*
* Before applying visitor:
* SELECT test_function(number) FROM system.numbers LIMIT 10;
*
* After applying visitor:
* SELECT number + 1 FROM system.numbers LIMIT 10;
*/
class UserDefinedSQLFunctionVisitor
{
public:
static void visit(ASTPtr & ast);
private:
static void visit(IAST *);
static ASTPtr tryToReplaceFunction(const ASTFunction & function, std::unordered_set<std::string> & udf_in_replace_process);
};
}
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