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107 lines
3.8 KiB
C++
107 lines
3.8 KiB
C++
#include <Common/typeid_cast.h>
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#include <Common/Exception.h>
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#include <Core/Block.h>
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#include <Storages/StorageValues.h>
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#include <DataTypes/DataTypeTuple.h>
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#include <Parsers/ASTExpressionList.h>
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#include <Parsers/ASTLiteral.h>
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#include <Parsers/ASTFunction.h>
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#include <TableFunctions/ITableFunction.h>
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#include <TableFunctions/TableFunctionValues.h>
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#include <TableFunctions/TableFunctionFactory.h>
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#include <TableFunctions/parseColumnsListForTableFunction.h>
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#include <Access/AccessFlags.h>
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#include <Interpreters/convertFieldToType.h>
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#include <Interpreters/evaluateConstantExpression.h>
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#include <Interpreters/Context.h>
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#include "registerTableFunctions.h"
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int LOGICAL_ERROR;
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extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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}
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static void parseAndInsertValues(MutableColumns & res_columns, const ASTs & args, const Block & sample_block, const Context & context)
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{
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if (res_columns.size() == 1) /// Parsing arguments as Fields
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{
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for (size_t i = 1; i < args.size(); ++i)
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{
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const auto & [value_field, value_type_ptr] = evaluateConstantExpression(args[i], context);
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Field value = convertFieldToType(value_field, *sample_block.getByPosition(0).type, value_type_ptr.get());
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res_columns[0]->insert(value);
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}
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}
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else /// Parsing arguments as Tuples
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{
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for (size_t i = 1; i < args.size(); ++i)
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{
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const auto & [value_field, value_type_ptr] = evaluateConstantExpression(args[i], context);
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const DataTypes & value_types_tuple = typeid_cast<const DataTypeTuple *>(value_type_ptr.get())->getElements();
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const Tuple & value_tuple = value_field.safeGet<Tuple>();
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if (value_tuple.size() != sample_block.columns())
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throw Exception("Values size should match with number of columns", ErrorCodes::LOGICAL_ERROR);
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for (size_t j = 0; j < value_tuple.size(); ++j)
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{
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Field value = convertFieldToType(value_tuple[j], *sample_block.getByPosition(j).type, value_types_tuple[j].get());
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res_columns[j]->insert(value);
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}
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}
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}
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}
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StoragePtr TableFunctionValues::executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name) const
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{
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ASTs & args_func = ast_function->children;
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if (args_func.size() != 1)
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throw Exception("Table function '" + getName() + "' must have arguments.", ErrorCodes::LOGICAL_ERROR);
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ASTs & args = args_func.at(0)->children;
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if (args.size() < 2)
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throw Exception("Table function '" + getName() + "' requires 2 or more arguments: structure and values.",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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context.checkAccess(AccessType::values);
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/// Parsing first argument as table structure and creating a sample block
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std::string structure = args[0]->as<ASTLiteral &>().value.safeGet<String>();
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ColumnsDescription columns = parseColumnsListFromString(structure, context);
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Block sample_block;
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for (const auto & name_type : columns.getOrdinary())
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sample_block.insert({ name_type.type->createColumn(), name_type.type, name_type.name });
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MutableColumns res_columns = sample_block.cloneEmptyColumns();
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/// Parsing other arguments as values and inserting them into columns
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parseAndInsertValues(res_columns, args, sample_block, context);
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Block res_block = sample_block.cloneWithColumns(std::move(res_columns));
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auto res = StorageValues::create(StorageID(getDatabaseName(), table_name), columns, res_block);
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res->startup();
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return res;
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}
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void registerTableFunctionValues(TableFunctionFactory & factory)
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{
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factory.registerFunction<TableFunctionValues>(TableFunctionFactory::CaseInsensitive);
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}
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}
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