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59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
#include <TableFunctions/ITableFunction.h>
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#include <TableFunctions/TableFunctionInput.h>
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#include <TableFunctions/TableFunctionFactory.h>
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#include <TableFunctions/parseColumnsListForTableFunction.h>
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#include <Parsers/ASTFunction.h>
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#include <Parsers/ASTLiteral.h>
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#include <Common/Exception.h>
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#include <Common/typeid_cast.h>
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#include <Storages/StorageInput.h>
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#include <DataTypes/DataTypeFactory.h>
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#include <Interpreters/evaluateConstantExpression.h>
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#include <boost/algorithm/string.hpp>
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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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void TableFunctionInput::parseArguments(const ASTPtr & ast_function, const Context & context)
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{
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const auto * function = ast_function->as<ASTFunction>();
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if (!function->arguments)
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throw Exception("Table function '" + getName() + "' must have arguments", ErrorCodes::LOGICAL_ERROR);
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auto args = function->arguments->children;
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if (args.size() != 1)
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throw Exception("Table function '" + getName() + "' requires exactly 1 argument: structure",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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structure = evaluateConstantExpressionOrIdentifierAsLiteral(args[0], context)->as<ASTLiteral &>().value.safeGet<String>();
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}
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ColumnsDescription TableFunctionInput::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 TableFunctionInput::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 storage = StorageInput::create(StorageID(getDatabaseName(), table_name), getActualTableStructure(context));
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storage->startup();
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return storage;
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}
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void registerTableFunctionInput(TableFunctionFactory & factory)
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{
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factory.registerFunction<TableFunctionInput>();
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}
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}
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