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#include <TableFunctions/TableFunctionExecutable.h>
#include <Common/Exception.h>
#include <TableFunctions/TableFunctionFactory.h>
#include <Analyzer/TableFunctionNode.h>
#include <Interpreters/parseColumnsListForTableFunction.h>
#include <Parsers/ASTFunction.h>
#include <Parsers/ASTIdentifier.h>
#include <Parsers/ASTSelectWithUnionQuery.h>
#include <Parsers/ASTSetQuery.h>
#include <Parsers/ASTSubquery.h>
#include <Parsers/parseQuery.h>
#include <Storages/checkAndGetLiteralArgument.h>
#include <Storages/StorageExecutable.h>
#include <DataTypes/DataTypeFactory.h>
#include <Interpreters/evaluateConstantExpression.h>
#include <Interpreters/interpretSubquery.h>
#include <boost/algorithm/string.hpp>
#include "registerTableFunctions.h"
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
extern const int BAD_ARGUMENTS;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
}
std::vector<size_t> TableFunctionExecutable::skipAnalysisForArguments(const QueryTreeNodePtr & query_node_table_function, ContextPtr) const
{
const auto & table_function_node = query_node_table_function->as<TableFunctionNode &>();
const auto & table_function_node_arguments = table_function_node.getArguments().getNodes();
size_t table_function_node_arguments_size = table_function_node_arguments.size();
if (table_function_node_arguments_size <= 3)
return {};
std::vector<size_t> result_indexes;
result_indexes.reserve(table_function_node_arguments_size - 3);
for (size_t i = 3; i < table_function_node_arguments_size; ++i)
result_indexes.push_back(i);
return result_indexes;
}
void TableFunctionExecutable::parseArguments(const ASTPtr & ast_function, ContextPtr context)
{
const auto * function = ast_function->as<ASTFunction>();
if (!function->arguments)
throw Exception(ErrorCodes::LOGICAL_ERROR,
"Table function '{}' must have arguments",
getName());
auto args = function->arguments->children;
if (args.size() < 3)
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
"Table function '{}' requires minimum 3 arguments: script_name, format, structure, [input_query...]",
getName());
auto check_argument = [&](size_t i, const std::string & argument_name)
{
if (!args[i]->as<ASTIdentifier>() &&
!args[i]->as<ASTLiteral>() &&
!args[i]->as<ASTQueryParameter>() &&
!args[i]->as<ASTSubquery>())
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Illegal type of argument '{}' for table function '{}': must be an identifier or string literal",
argument_name, getName());
};
check_argument(0, "script_name");
check_argument(1, "format");
check_argument(2, "structure");
for (size_t i = 0; i <= 2; ++i)
args[i] = evaluateConstantExpressionOrIdentifierAsLiteral(args[i], context);
auto script_name_with_arguments_value = checkAndGetLiteralArgument<String>(args[0], "script_name_with_arguments_value");
std::vector<String> script_name_with_arguments;
boost::split(script_name_with_arguments, script_name_with_arguments_value, [](char c){ return c == ' '; });
script_name = std::move(script_name_with_arguments[0]);
script_name_with_arguments.erase(script_name_with_arguments.begin());
arguments = std::move(script_name_with_arguments);
format = checkAndGetLiteralArgument<String>(args[1], "format");
structure = checkAndGetLiteralArgument<String>(args[2], "structure");
for (size_t i = 3; i < args.size(); ++i)
{
if (args[i]->as<ASTSetQuery>())
{
settings_query = std::move(args[i]);
}
else
{
ASTPtr query;
if (!args[i]->children.empty())
query = args[i]->children.at(0);
if (query && query->as<ASTSelectWithUnionQuery>())
{
input_queries.emplace_back(std::move(query));
}
else
{
throw Exception(
ErrorCodes::BAD_ARGUMENTS,
"Table function '{}' argument is invalid {}",
getName(),
args[i]->formatForErrorMessage());
}
}
}
}
ColumnsDescription TableFunctionExecutable::getActualTableStructure(ContextPtr context, bool /*is_insert_query*/) const
{
return parseColumnsListFromString(structure, context);
}
StoragePtr TableFunctionExecutable::executeImpl(const ASTPtr & /*ast_function*/, ContextPtr context, const std::string & table_name, ColumnsDescription /*cached_columns*/, bool is_insert_query) const
{
auto storage_id = StorageID(getDatabaseName(), table_name);
auto global_context = context->getGlobalContext();
ExecutableSettings settings;
settings.script_name = script_name;
settings.script_arguments = arguments;
if (settings_query != nullptr)
settings.applyChanges(settings_query->as<ASTSetQuery>()->changes);
auto storage = std::make_shared<StorageExecutable>(storage_id, format, settings, input_queries, getActualTableStructure(context, is_insert_query), ConstraintsDescription{});
storage->startup();
return storage;
}
void registerTableFunctionExecutable(TableFunctionFactory & factory)
{
factory.registerFunction<TableFunctionExecutable>();
}
}
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