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#include <Storages/MutationCommands.h>
#include <IO/WriteHelpers.h>
#include <IO/ReadHelpers.h>
#include <Parsers/formatAST.h>
#include <Parsers/ParserAlterQuery.h>
#include <Parsers/parseQuery.h>
#include <Parsers/ASTAssignment.h>
#include <Parsers/ASTColumnDeclaration.h>
#include <Parsers/ASTFunction.h>
#include <Parsers/ASTIdentifier.h>
#include <Common/typeid_cast.h>
#include <Common/quoteString.h>
#include <Core/Defines.h>
#include <DataTypes/DataTypeFactory.h>
namespace DB
{
namespace ErrorCodes
{
extern const int UNKNOWN_MUTATION_COMMAND;
extern const int MULTIPLE_ASSIGNMENTS_TO_COLUMN;
}
bool MutationCommand::isBarrierCommand() const
{
return type == RENAME_COLUMN;
}
std::optional<MutationCommand> MutationCommand::parse(ASTAlterCommand * command, bool parse_alter_commands)
{
if (command->type == ASTAlterCommand::DELETE)
{
MutationCommand res;
res.ast = command->ptr();
res.type = DELETE;
res.predicate = command->predicate;
res.partition = command->partition;
return res;
}
else if (command->type == ASTAlterCommand::UPDATE)
{
MutationCommand res;
res.ast = command->ptr();
res.type = UPDATE;
res.predicate = command->predicate;
res.partition = command->partition;
for (const ASTPtr & assignment_ast : command->update_assignments->children)
{
const auto & assignment = assignment_ast->as<ASTAssignment &>();
auto insertion = res.column_to_update_expression.emplace(assignment.column_name, assignment.expression());
if (!insertion.second)
throw Exception(ErrorCodes::MULTIPLE_ASSIGNMENTS_TO_COLUMN,
"Multiple assignments in the single statement to column {}",
backQuote(assignment.column_name));
}
return res;
}
else if (command->type == ASTAlterCommand::MATERIALIZE_INDEX)
{
MutationCommand res;
res.ast = command->ptr();
res.type = MATERIALIZE_INDEX;
res.partition = command->partition;
res.predicate = nullptr;
res.index_name = command->index->as<ASTIdentifier &>().name();
return res;
}
else if (command->type == ASTAlterCommand::MATERIALIZE_PROJECTION)
{
MutationCommand res;
res.ast = command->ptr();
res.type = MATERIALIZE_PROJECTION;
res.partition = command->partition;
res.predicate = nullptr;
res.projection_name = command->projection->as<ASTIdentifier &>().name();
return res;
}
else if (command->type == ASTAlterCommand::MATERIALIZE_COLUMN)
{
MutationCommand res;
res.ast = command->ptr();
res.type = MATERIALIZE_COLUMN;
res.partition = command->partition;
res.column_name = getIdentifierName(command->column);
return res;
}
else if (parse_alter_commands && command->type == ASTAlterCommand::MODIFY_COLUMN)
{
MutationCommand res;
res.ast = command->ptr();
res.type = MutationCommand::Type::READ_COLUMN;
const auto & ast_col_decl = command->col_decl->as<ASTColumnDeclaration &>();
res.column_name = ast_col_decl.name;
res.data_type = DataTypeFactory::instance().get(ast_col_decl.type);
return res;
}
else if (parse_alter_commands && command->type == ASTAlterCommand::DROP_COLUMN)
{
MutationCommand res;
res.ast = command->ptr();
res.type = MutationCommand::Type::DROP_COLUMN;
res.column_name = getIdentifierName(command->column);
if (command->partition)
res.partition = command->partition;
if (command->clear_column)
res.clear = true;
return res;
}
else if (parse_alter_commands && command->type == ASTAlterCommand::DROP_INDEX)
{
MutationCommand res;
res.ast = command->ptr();
res.type = MutationCommand::Type::DROP_INDEX;
res.column_name = command->index->as<ASTIdentifier &>().name();
if (command->partition)
res.partition = command->partition;
if (command->clear_index)
res.clear = true;
return res;
}
else if (parse_alter_commands && command->type == ASTAlterCommand::DROP_PROJECTION)
{
MutationCommand res;
res.ast = command->ptr();
res.type = MutationCommand::Type::DROP_PROJECTION;
res.column_name = command->projection->as<ASTIdentifier &>().name();
if (command->partition)
res.partition = command->partition;
if (command->clear_projection)
res.clear = true;
return res;
}
else if (parse_alter_commands && command->type == ASTAlterCommand::RENAME_COLUMN)
{
MutationCommand res;
res.ast = command->ptr();
res.type = MutationCommand::Type::RENAME_COLUMN;
res.column_name = command->column->as<ASTIdentifier &>().name();
res.rename_to = command->rename_to->as<ASTIdentifier &>().name();
return res;
}
else if (command->type == ASTAlterCommand::MATERIALIZE_TTL)
{
MutationCommand res;
res.ast = command->ptr();
res.type = MATERIALIZE_TTL;
res.partition = command->partition;
return res;
}
else
{
MutationCommand res;
res.ast = command->ptr();
res.type = ALTER_WITHOUT_MUTATION;
return res;
}
}
std::shared_ptr<ASTExpressionList> MutationCommands::ast(bool with_pure_metadata_commands) const
{
auto res = std::make_shared<ASTExpressionList>();
for (const MutationCommand & command : *this)
{
if (command.type != MutationCommand::ALTER_WITHOUT_MUTATION || with_pure_metadata_commands)
res->children.push_back(command.ast->clone());
}
return res;
}
void MutationCommands::writeText(WriteBuffer & out, bool with_pure_metadata_commands) const
{
WriteBufferFromOwnString commands_buf;
formatAST(*ast(with_pure_metadata_commands), commands_buf, /* hilite = */ false, /* one_line = */ true);
writeEscapedString(commands_buf.str(), out);
}
void MutationCommands::readText(ReadBuffer & in)
{
String commands_str;
readEscapedString(commands_str, in);
ParserAlterCommandList p_alter_commands;
auto commands_ast = parseQuery(
p_alter_commands, commands_str.data(), commands_str.data() + commands_str.length(), "mutation commands list", 0, DBMS_DEFAULT_MAX_PARSER_DEPTH);
for (const auto & child : commands_ast->children)
{
auto * command_ast = child->as<ASTAlterCommand>();
auto command = MutationCommand::parse(command_ast, true);
if (!command)
throw Exception(ErrorCodes::UNKNOWN_MUTATION_COMMAND, "Unknown mutation command type: {}", DB::toString<int>(command_ast->type));
push_back(std::move(*command));
}
}
std::string MutationCommands::toString() const
{
WriteBufferFromOwnString commands_buf;
formatAST(*ast(), commands_buf, /* hilite = */ false, /* one_line = */ true);
return commands_buf.str();
}
bool MutationCommands::hasNonEmptyMutationCommands() const
{
for (const auto & command : *this)
{
if (command.type != MutationCommand::Type::EMPTY && command.type != MutationCommand::Type::ALTER_WITHOUT_MUTATION)
return true;
}
return false;
}
bool MutationCommands::containBarrierCommand() const
{
for (const auto & command : *this)
{
if (command.isBarrierCommand())
return true;
}
return false;
}
}
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