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98 lines
3.2 KiB
C++
98 lines
3.2 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/StorageGenerateRandom.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/TableFunctionFactory.h>
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#include <TableFunctions/TableFunctionGenerateRandom.h>
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#include <TableFunctions/parseColumnsListForTableFunction.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 BAD_ARGUMENTS;
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extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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extern const int LOGICAL_ERROR;
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}
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void TableFunctionGenerateRandom::parseArguments(const ASTPtr & ast_function, const Context & /*context*/)
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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.empty())
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throw Exception("Table function '" + getName() + "' requires at least one argument: "
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" structure, [random_seed, max_string_length, max_array_length].",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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if (args.size() > 4)
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throw Exception("Table function '" + getName() + "' requires at most four arguments: "
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" structure, [random_seed, max_string_length, max_array_length].",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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// All the arguments must be literals.
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for (const auto & arg : args)
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{
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if (!arg->as<const ASTLiteral>())
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{
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throw Exception(fmt::format(
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"All arguments of table function '{}' must be literals. "
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"Got '{}' instead", getName(), arg->formatForErrorMessage()),
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ErrorCodes::BAD_ARGUMENTS);
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}
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}
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/// Parsing first argument as table structure and creating a sample block
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structure = args[0]->as<const ASTLiteral &>().value.safeGet<String>();
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if (args.size() >= 2)
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{
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const Field & value = args[1]->as<const ASTLiteral &>().value;
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if (!value.isNull())
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random_seed = value.safeGet<UInt64>();
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}
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if (args.size() >= 3)
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max_string_length = args[2]->as<const ASTLiteral &>().value.safeGet<UInt64>();
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if (args.size() == 4)
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max_array_length = args[3]->as<const ASTLiteral &>().value.safeGet<UInt64>();
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}
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ColumnsDescription TableFunctionGenerateRandom::getActualTableStructure(const Context & context) const
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{
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return parseColumnsListFromString(structure, context);
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}
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StoragePtr TableFunctionGenerateRandom::executeImpl(const ASTPtr & /*ast_function*/, const Context & context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
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{
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auto columns = getActualTableStructure(context);
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auto res = StorageGenerateRandom::create(StorageID(getDatabaseName(), table_name), columns, max_array_length, max_string_length, random_seed);
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res->startup();
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return res;
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}
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void registerTableFunctionGenerate(TableFunctionFactory & factory)
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{
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factory.registerFunction<TableFunctionGenerateRandom>();
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}
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}
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