Method getDescDialect1

src/dsql/ExprNodes.cpp:1352–1628

}

void ArithmeticNode::getDescDialect1(thread_db* /*tdbb*/, dsc* desc, dsc& desc1, dsc& desc2)
{
	USHORT dtype = 0;

	switch (blrOp)
	{
		case blr_add:
		case blr_subtract:
		{
			/* 92/05/29 DAVES - don't understand why this is done for ONLY
				dtype_text (eg: not dtype_cstring or dtype_varying) Doesn't
				appear to hurt.

				94/04/04 DAVES - NOW I understand it!  QLI will pass floating
				point values to the engine as text.  All other numeric constants
				it turns into either integers or longs (with scale). */

			USHORT dtype1 = desc1.dsc_dtype;
			if (dtype1 == dtype_int64)
				dtype1 = dtype_double;

			USHORT dtype2 = desc2.dsc_dtype;
			if (dtype2 == dtype_int64)
				dtype2 = dtype_double;

			if (dtype1 == dtype_text || dtype2 == dtype_text)
				dtype = MAX(MAX(dtype1, dtype2), (UCHAR) DEFAULT_DOUBLE);
			else
				dtype = MAX(dtype1, dtype2);

			switch (dtype)
			{
				case dtype_short:
					desc->dsc_dtype = dtype_long;
					desc->dsc_length = sizeof(SLONG);
					if (DTYPE_IS_TEXT(desc1.dsc_dtype) || DTYPE_IS_TEXT(desc2.dsc_dtype))
						desc->dsc_scale = 0;
					else
						desc->dsc_scale = MIN(desc1.dsc_scale, desc2.dsc_scale);

					nodScale = desc->dsc_scale;
					setFixedSubType(desc, desc1, desc2);
					desc->dsc_flags = 0;
					return;

				case dtype_ex_time_tz:
				case dtype_ex_timestamp_tz:
					fb_assert(false);
					ERRD_post(Arg::Gds(isc_expression_eval_err));

				case dtype_sql_date:
				case dtype_sql_time:
				case dtype_sql_time_tz:
					if (DTYPE_IS_TEXT(desc1.dsc_dtype) || DTYPE_IS_TEXT(desc2.dsc_dtype))
						ERR_post(Arg::Gds(isc_expression_eval_err));
					// fall into

				case dtype_timestamp: