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#pragma once
#include <Parsers/IAST.h>
#include <Interpreters/InDepthNodeVisitor.h>
namespace DB
{
class ASTFunction;
/// Extract constant arguments out of aggregate functions from child functions
/// 'sum(a * 2)' -> 'sum(a) * 2'
/// Rewrites: sum([multiply|divide]) -> [multiply|divide](sum)
/// [min|max|avg]([multiply|divide|plus|minus]) -> [multiply|divide|plus|minus]([min|max|avg])
/// TODO: groupBitAnd, groupBitOr, groupBitXor
/// TODO: better constant detection: f(const) is not detected as const.
/// TODO: 'f((2 * n) * n)' -> '2 * f(n * n)'
class ArithmeticOperationsInAgrFuncMatcher
{
public:
struct Data {};
static void visit(ASTPtr & ast, Data & data);
static void visit(const ASTFunction &, ASTPtr & ast, Data & data);
static bool needChildVisit(const ASTPtr & node, const ASTPtr & child);
};
using ArithmeticOperationsInAgrFuncVisitor = InDepthNodeVisitor<ArithmeticOperationsInAgrFuncMatcher, false>;
}
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