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#include <Storages/KeyDescription.h>
#include <Functions/IFunction.h>
#include <Parsers/ASTIdentifier.h>
#include <Parsers/ASTFunction.h>
#include <Interpreters/ExpressionActions.h>
#include <Interpreters/ExpressionAnalyzer.h>
#include <Interpreters/TreeRewriter.h>
#include <Storages/extractKeyExpressionList.h>
#include <Common/quoteString.h>
#include <Interpreters/FunctionNameNormalizer.h>
#include <Parsers/ExpressionListParsers.h>
#include <Parsers/parseQuery.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
extern const int DATA_TYPE_CANNOT_BE_USED_IN_KEY;
}
KeyDescription::KeyDescription(const KeyDescription & other)
: definition_ast(other.definition_ast ? other.definition_ast->clone() : nullptr)
, expression_list_ast(other.expression_list_ast ? other.expression_list_ast->clone() : nullptr)
, sample_block(other.sample_block)
, column_names(other.column_names)
, data_types(other.data_types)
, additional_column(other.additional_column)
{
if (other.expression)
expression = other.expression->clone();
}
KeyDescription & KeyDescription::operator=(const KeyDescription & 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();
if (other.expression)
expression = other.expression->clone();
else
expression.reset();
sample_block = other.sample_block;
column_names = other.column_names;
data_types = other.data_types;
/// additional_column is constant property It should never be lost.
if (additional_column.has_value() && !other.additional_column.has_value())
throw Exception(ErrorCodes::LOGICAL_ERROR, "Wrong key assignment, losing additional_column");
additional_column = other.additional_column;
return *this;
}
void KeyDescription::recalculateWithNewAST(
const ASTPtr & new_ast,
const ColumnsDescription & columns,
ContextPtr context)
{
*this = getSortingKeyFromAST(new_ast, columns, context, additional_column);
}
void KeyDescription::recalculateWithNewColumns(
const ColumnsDescription & new_columns,
ContextPtr context)
{
*this = getSortingKeyFromAST(definition_ast, new_columns, context, additional_column);
}
KeyDescription KeyDescription::getKeyFromAST(
const ASTPtr & definition_ast,
const ColumnsDescription & columns,
ContextPtr context)
{
return getSortingKeyFromAST(definition_ast, columns, context, {});
}
bool KeyDescription::moduloToModuloLegacyRecursive(ASTPtr node_expr)
{
if (!node_expr)
return false;
auto * function_expr = node_expr->as<ASTFunction>();
bool modulo_in_ast = false;
if (function_expr)
{
if (function_expr->name == "modulo")
{
function_expr->name = "moduloLegacy";
modulo_in_ast = true;
}
if (function_expr->arguments)
{
auto children = function_expr->arguments->children;
for (const auto & child : children)
modulo_in_ast |= moduloToModuloLegacyRecursive(child);
}
}
return modulo_in_ast;
}
KeyDescription KeyDescription::getSortingKeyFromAST(
const ASTPtr & definition_ast,
const ColumnsDescription & columns,
ContextPtr context,
const std::optional<String> & additional_column)
{
KeyDescription result;
result.definition_ast = definition_ast;
result.expression_list_ast = extractKeyExpressionList(definition_ast);
if (additional_column)
{
result.additional_column = additional_column;
ASTPtr column_identifier = std::make_shared<ASTIdentifier>(*additional_column);
result.expression_list_ast->children.push_back(column_identifier);
}
const auto & children = result.expression_list_ast->children;
for (const auto & child : children)
result.column_names.emplace_back(child->getColumnName());
{
auto expr = result.expression_list_ast->clone();
auto syntax_result = TreeRewriter(context).analyze(expr, columns.getAllPhysical());
/// In expression we also need to store source columns
result.expression = ExpressionAnalyzer(expr, syntax_result, context).getActions(false);
/// In sample block we use just key columns
result.sample_block = ExpressionAnalyzer(expr, syntax_result, context).getActions(true)->getSampleBlock();
}
for (size_t i = 0; i < result.sample_block.columns(); ++i)
{
result.data_types.emplace_back(result.sample_block.getByPosition(i).type);
if (!result.data_types.back()->isComparable())
throw Exception(ErrorCodes::DATA_TYPE_CANNOT_BE_USED_IN_KEY,
"Column {} with type {} is not allowed in key expression, it's not comparable",
backQuote(result.sample_block.getByPosition(i).name), result.data_types.back()->getName());
}
return result;
}
KeyDescription KeyDescription::buildEmptyKey()
{
KeyDescription result;
result.expression_list_ast = std::make_shared<ASTExpressionList>();
result.expression = std::make_shared<ExpressionActions>(std::make_shared<ActionsDAG>(), ExpressionActionsSettings{});
return result;
}
KeyDescription KeyDescription::parse(const String & str, const ColumnsDescription & columns, ContextPtr context)
{
KeyDescription result;
if (str.empty())
return result;
ParserExpression parser;
ASTPtr ast = parseQuery(parser, "(" + str + ")", 0, DBMS_DEFAULT_MAX_PARSER_DEPTH);
FunctionNameNormalizer().visit(ast.get());
return getKeyFromAST(ast, columns, context);
}
}
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