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#include <Interpreters/ExpressionAnalyzer.h>
#include <Interpreters/TreeRewriter.h>
#include <Storages/IndicesDescription.h>
#include <Parsers/ASTFunction.h>
#include <Parsers/ASTIndexDeclaration.h>
#include <Parsers/ASTLiteral.h>
#include <Parsers/ParserCreateQuery.h>
#include <Parsers/formatAST.h>
#include <Parsers/parseQuery.h>
#include <Storages/extractKeyExpressionList.h>
#include <Core/Defines.h>
#include "Common/Exception.h"
namespace DB
{
namespace ErrorCodes
{
extern const int INCORRECT_QUERY;
extern const int LOGICAL_ERROR;
}
IndexDescription::IndexDescription(const IndexDescription & other)
: definition_ast(other.definition_ast ? other.definition_ast->clone() : nullptr)
, expression_list_ast(other.expression_list_ast ? other.expression_list_ast->clone() : nullptr)
, name(other.name)
, type(other.type)
, arguments(other.arguments)
, column_names(other.column_names)
, data_types(other.data_types)
, sample_block(other.sample_block)
, granularity(other.granularity)
{
if (other.expression)
expression = other.expression->clone();
}
IndexDescription & IndexDescription::operator=(const IndexDescription & other)
{
if (&other == this)
return *this;
if (other.definition_ast)
definition_ast = other.definition_ast->clone();
else
definition_ast.reset();
if (other.expression_list_ast)
expression_list_ast = other.expression_list_ast->clone();
else
expression_list_ast.reset();
name = other.name;
type = other.type;
if (other.expression)
expression = other.expression->clone();
else
expression.reset();
arguments = other.arguments;
column_names = other.column_names;
data_types = other.data_types;
sample_block = other.sample_block;
granularity = other.granularity;
return *this;
}
IndexDescription IndexDescription::getIndexFromAST(const ASTPtr & definition_ast, const ColumnsDescription & columns, ContextPtr context)
{
const auto * index_definition = definition_ast->as<ASTIndexDeclaration>();
if (!index_definition)
throw Exception(ErrorCodes::LOGICAL_ERROR, "Cannot create skip index from non ASTIndexDeclaration AST");
if (index_definition->name.empty())
throw Exception(ErrorCodes::INCORRECT_QUERY, "Skip index must have name in definition.");
if (!index_definition->type)
throw Exception(ErrorCodes::INCORRECT_QUERY, "TYPE is required for index");
if (index_definition->type->parameters && !index_definition->type->parameters->children.empty())
throw Exception(ErrorCodes::INCORRECT_QUERY, "Index type cannot have parameters");
IndexDescription result;
result.definition_ast = index_definition->clone();
result.name = index_definition->name;
result.type = Poco::toLower(index_definition->type->name);
result.granularity = index_definition->granularity;
ASTPtr expr_list;
if (index_definition->expr)
{
expr_list = extractKeyExpressionList(index_definition->expr->clone());
result.expression_list_ast = expr_list->clone();
}
else
{
throw Exception(ErrorCodes::LOGICAL_ERROR, "Expression is not set");
}
auto syntax = TreeRewriter(context).analyze(expr_list, columns.getAllPhysical());
result.expression = ExpressionAnalyzer(expr_list, syntax, context).getActions(true);
result.sample_block = result.expression->getSampleBlock();
for (auto & elem : result.sample_block)
{
if (!elem.column)
elem.column = elem.type->createColumn();
result.column_names.push_back(elem.name);
result.data_types.push_back(elem.type);
}
const auto & definition_arguments = index_definition->type->arguments;
if (definition_arguments)
{
for (size_t i = 0; i < definition_arguments->children.size(); ++i)
{
const auto * argument = definition_arguments->children[i]->as<ASTLiteral>();
if (!argument)
throw Exception(ErrorCodes::INCORRECT_QUERY, "Only literals can be skip index arguments");
result.arguments.emplace_back(argument->value);
}
}
return result;
}
void IndexDescription::recalculateWithNewColumns(const ColumnsDescription & new_columns, ContextPtr context)
{
*this = getIndexFromAST(definition_ast, new_columns, context);
}
bool IndicesDescription::has(const String & name) const
{
for (const auto & index : *this)
if (index.name == name)
return true;
return false;
}
String IndicesDescription::toString() const
{
if (empty())
return {};
ASTExpressionList list;
for (const auto & index : *this)
list.children.push_back(index.definition_ast);
return serializeAST(list);
}
IndicesDescription IndicesDescription::parse(const String & str, const ColumnsDescription & columns, ContextPtr context)
{
IndicesDescription result;
if (str.empty())
return result;
ParserIndexDeclarationList parser;
ASTPtr list = parseQuery(parser, str, 0, DBMS_DEFAULT_MAX_PARSER_DEPTH);
for (const auto & index : list->children)
result.emplace_back(IndexDescription::getIndexFromAST(index, columns, context));
return result;
}
ExpressionActionsPtr IndicesDescription::getSingleExpressionForIndices(const ColumnsDescription & columns, ContextPtr context) const
{
ASTPtr combined_expr_list = std::make_shared<ASTExpressionList>();
for (const auto & index : *this)
for (const auto & index_expr : index.expression_list_ast->children)
combined_expr_list->children.push_back(index_expr->clone());
auto syntax_result = TreeRewriter(context).analyze(combined_expr_list, columns.getAllPhysical());
return ExpressionAnalyzer(combined_expr_list, syntax_result, context).getActions(false);
}
Names IndicesDescription::getAllRegisteredNames() const
{
Names result;
for (const auto & index : *this)
{
result.emplace_back(index.name);
}
return result;
}
}
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