Method tryReadValue

src/Processors/Formats/Impl/ValuesBlockInputFormat.cpp:186–219

}

bool ValuesBlockInputFormat::tryReadValue(IColumn & column, size_t column_idx)
{
    bool rollback_on_exception = false;
    try
    {
        bool read = true;
        const auto & type = types[column_idx];
        const auto & serialization = serializations[column_idx];
        if (format_settings.null_as_default && !type->isNullable())
            read = SerializationNullable::deserializeTextQuotedImpl(column, buf, format_settings, serialization);
        else
            serialization->deserializeTextQuoted(column, buf, format_settings);

        rollback_on_exception = true;

        skipWhitespaceIfAny(buf);
        assertDelimiterAfterValue(column_idx);
        return read;
    }
    catch (const Exception & e)
    {
        /// Do not consider decimal overflow as parse error to avoid attempts to parse it as expression with float literal
        bool decimal_overflow = e.code() == ErrorCodes::ARGUMENT_OUT_OF_BOUND;
        if (!isParseError(e.code()) || decimal_overflow)
            throw;
        if (rollback_on_exception)
            column.popBack(1);

        /// Switch to SQL parser and don't try to use streaming parser for complex expressions
        /// Note: Throwing exceptions for each expression may be very slow because of stacktraces
        buf.rollbackToCheckpoint();
        return parseExpression(column, column_idx);
    }
}

namespace
{