2011-10-30 05:19:41 +00:00
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#include <DB/IO/ReadHelpers.h>
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2016-02-13 06:37:19 +00:00
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#include <DB/Interpreters/evaluateConstantExpression.h>
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#include <DB/Interpreters/convertFieldToType.h>
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#include <DB/Parsers/ExpressionListParsers.h>
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2011-10-30 05:19:41 +00:00
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#include <DB/DataStreams/ValuesRowInputStream.h>
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2016-02-13 06:37:19 +00:00
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#include <DB/Core/FieldVisitors.h>
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2011-10-30 05:19:41 +00:00
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namespace DB
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{
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2016-02-13 06:37:19 +00:00
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namespace ErrorCodes
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{
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extern const int CANNOT_PARSE_INPUT_ASSERTION_FAILED;
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extern const int CANNOT_PARSE_QUOTED_STRING;
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extern const int CANNOT_PARSE_DATE;
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extern const int CANNOT_PARSE_DATETIME;
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extern const int CANNOT_READ_ARRAY_FROM_TEXT;
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extern const int CANNOT_PARSE_DATE;
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extern const int SYNTAX_ERROR;
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extern const int VALUE_IS_OUT_OF_RANGE_OF_DATA_TYPE;
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}
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2011-10-30 05:19:41 +00:00
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2016-02-13 06:37:19 +00:00
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ValuesRowInputStream::ValuesRowInputStream(ReadBuffer & istr_, const Block & sample_, const Context & context_)
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: istr(istr_), sample(sample_), context(context_)
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2011-10-30 05:19:41 +00:00
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{
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2011-11-06 05:01:42 +00:00
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size_t columns = sample.columns();
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data_types.resize(columns);
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for (size_t i = 0; i < columns; ++i)
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data_types[i] = sample.getByPosition(i).type;
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2011-10-30 05:19:41 +00:00
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}
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2013-01-07 00:57:43 +00:00
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bool ValuesRowInputStream::read(Row & row)
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2011-10-30 05:19:41 +00:00
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{
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2011-11-06 05:01:42 +00:00
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size_t size = data_types.size();
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2013-01-07 00:57:43 +00:00
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row.resize(size);
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2011-10-30 05:19:41 +00:00
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skipWhitespaceIfAny(istr);
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2012-05-21 06:49:05 +00:00
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if (istr.eof() || *istr.position() == ';')
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2011-10-30 05:19:41 +00:00
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{
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2013-01-07 00:57:43 +00:00
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row.clear();
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return false;
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2011-10-30 05:19:41 +00:00
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}
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2012-05-21 06:49:05 +00:00
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2016-02-13 06:37:19 +00:00
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/** Как правило, это обычный формат для потокового парсинга.
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* Но в качестве исключения, поддерживается также обработка произвольных выражений вместо значений.
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* Это очень неэффективно. Но если выражений нет, то оверхед отсутствует.
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*/
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ParserExpressionWithOptionalAlias parser(false);
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2016-02-07 08:42:21 +00:00
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assertChar('(', istr);
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2011-10-30 05:19:41 +00:00
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for (size_t i = 0; i < size; ++i)
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{
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skipWhitespaceIfAny(istr);
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2016-02-07 08:42:21 +00:00
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2016-02-13 06:37:19 +00:00
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char * prev_istr_position = istr.position();
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size_t prev_istr_bytes = istr.count() - istr.offset();
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try
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{
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data_types[i]->deserializeTextQuoted(row[i], istr);
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skipWhitespaceIfAny(istr);
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if (i != size - 1)
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assertChar(',', istr);
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else
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assertChar(')', istr);
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}
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catch (const Exception & e)
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{
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/** Обычный потоковый парсер не смог распарсить значение.
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* Попробуем распарсить его SQL-парсером как константное выражение.
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* Это исключительный случай.
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*/
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if (e.code() == ErrorCodes::CANNOT_PARSE_INPUT_ASSERTION_FAILED
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|| e.code() == ErrorCodes::CANNOT_PARSE_QUOTED_STRING
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|| e.code() == ErrorCodes::CANNOT_PARSE_DATE
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|| e.code() == ErrorCodes::CANNOT_PARSE_DATETIME
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|| e.code() == ErrorCodes::CANNOT_READ_ARRAY_FROM_TEXT
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|| e.code() == ErrorCodes::CANNOT_PARSE_DATE)
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{
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/// TODO Работоспособность, если выражение не помещается целиком до конца буфера.
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/// Если начало значения уже не лежит в буфере.
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if (istr.count() - istr.offset() != prev_istr_bytes)
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throw;
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IParser::Pos pos = prev_istr_position;
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Expected expected = "";
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IParser::Pos max_parsed_pos = pos;
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ASTPtr ast;
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if (!parser.parse(pos, istr.buffer().end(), ast, max_parsed_pos, expected))
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throw Exception("Cannot parse expression of type " + data_types[i]->getName() + " here: "
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+ String(prev_istr_position, std::min(SHOW_CHARS_ON_SYNTAX_ERROR, istr.buffer().end() - prev_istr_position)),
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ErrorCodes::SYNTAX_ERROR);
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istr.position() = const_cast<char *>(max_parsed_pos);
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row[i] = convertFieldToType(evaluateConstantExpression(ast, context), *data_types[i]);
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/// TODO После добавления поддержки NULL, добавить сюда проверку на data type is nullable.
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if (row[i].isNull())
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throw Exception("Expression returns value " + apply_visitor(FieldVisitorToString(), row[i])
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+ ", that is out of range of type " + data_types[i]->getName()
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+ ", at: " + String(prev_istr_position, std::min(SHOW_CHARS_ON_SYNTAX_ERROR, istr.buffer().end() - prev_istr_position)),
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ErrorCodes::VALUE_IS_OUT_OF_RANGE_OF_DATA_TYPE);
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skipWhitespaceIfAny(istr);
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if (i != size - 1)
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assertChar(',', istr);
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else
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assertChar(')', istr);
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}
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else
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throw;
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}
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}
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2011-10-30 05:19:41 +00:00
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skipWhitespaceIfAny(istr);
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if (!istr.eof() && *istr.position() == ',')
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++istr.position();
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2013-01-07 00:57:43 +00:00
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return true;
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2011-10-30 05:19:41 +00:00
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}
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}
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