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#pragma once
#include <Interpreters/Aliases.h>
#include <Interpreters/Context_fwd.h>
#include <Interpreters/DatabaseAndTableWithAlias.h>
#include <Storages/IStorage_fwd.h>
#include <Parsers/IAST_fwd.h>
namespace DB
{
struct TreeRewriterResult;
/// Part of of Tree Rewriter (SyntaxAnalyzer) that optimizes AST.
/// Query should be ready to execute either before either after it. But resulting query could be faster.
class TreeOptimizer
{
public:
static void apply(
ASTPtr & query,
TreeRewriterResult & result,
const std::vector<TableWithColumnNamesAndTypes> & tables_with_columns,
ContextPtr context);
static void optimizeIf(ASTPtr & query, Aliases & aliases, bool if_chain_to_multiif, bool multiif_to_if);
static void optimizeCountConstantAndSumOne(ASTPtr & query, ContextPtr context);
static void optimizeGroupByFunctionKeys(ASTSelectQuery * select_query);
};
}
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