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79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
#include <TableFunctions/ITableFunction.h>
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#include <TableFunctions/ITableFunctionFileLike.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/StorageFile.h>
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#include <Access/AccessFlags.h>
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#include <Interpreters/Context.h>
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#include <Interpreters/evaluateConstantExpression.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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StoragePtr ITableFunctionFileLike::executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name) const
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{
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/// Parse args
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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 at least 2 arguments", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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for (auto & arg : args)
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arg = evaluateConstantExpressionOrIdentifierAsLiteral(arg, context);
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std::string filename = args[0]->as<ASTLiteral &>().value.safeGet<String>();
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std::string format = args[1]->as<ASTLiteral &>().value.safeGet<String>();
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if (args.size() == 2 && getName() == "file")
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{
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if (format != "Distributed")
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throw Exception("Table function '" + getName() + "' allows 2 arguments only for Distributed format.", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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}
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else if (args.size() != 3 && args.size() != 4)
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throw Exception("Table function '" + getName() + "' requires 3 or 4 arguments: filename, format, structure and compression method (default auto).",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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ColumnsDescription columns;
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std::string compression_method = "auto";
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if (args.size() > 2)
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{
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auto structure = args[2]->as<ASTLiteral &>().value.safeGet<String>();
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columns = parseColumnsListFromString(structure, context);
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}
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if (args.size() == 4)
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compression_method = args[3]->as<ASTLiteral &>().value.safeGet<String>();
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context.checkAccess(getRequiredAccessType());
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/// Create table
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StoragePtr storage = getStorage(filename, format, columns, const_cast<Context &>(context), table_name, compression_method);
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storage->startup();
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return storage;
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}
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}
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