private AggregationDistinctToken GenerateSQLToken(AggregationDistinctProjection projection) { ShardingAssert.ShouldBeNotNull(projection.GetAlias(), "alias is required"); String derivedAlias = DerivedColumn.IsDerivedColumnName(projection.GetAlias()) ? projection.GetAlias() : null; return(new AggregationDistinctToken(projection.StartIndex, projection.StopIndex, projection.GetDistinctInnerExpression(), derivedAlias)); }
private AggregationDistinctProjection CreateProjection(string sql, AggregationDistinctProjectionSegment projectionSegment) { var innerExpression = sql.SubStringWithEndIndex(projectionSegment.GetInnerExpressionStartIndex(), projectionSegment.GetStopIndex() + 1); var alias = projectionSegment.GetAlias() ?? DerivedColumn.Get(DerivedColumnEnum.AGGREGATION_DISTINCT_DERIVED).GetDerivedColumnAlias(aggregationDistinctDerivedColumnCount++); AggregationDistinctProjection result = new AggregationDistinctProjection( projectionSegment.GetStartIndex(), projectionSegment.GetStopIndex(), projectionSegment.GetAggregationType(), innerExpression, alias, projectionSegment.GetDistinctExpression()); if (AggregationTypeEnum.AVG == result.GetAggregationType()) { AppendAverageDistinctDerivedProjection(result); } return(result); }
private void AppendAverageDistinctDerivedProjection(AggregationDistinctProjection averageDistinctProjection) { var innerExpression = averageDistinctProjection.GetInnerExpression(); var distinctInnerExpression = averageDistinctProjection.GetDistinctInnerExpression(); var countAlias = DerivedColumn.Get(DerivedColumnEnum.AVG_COUNT_ALIAS).GetDerivedColumnAlias(aggregationAverageDerivedColumnCount); AggregationDistinctProjection countDistinctProjection = new AggregationDistinctProjection(0, 0, AggregationTypeEnum.COUNT, innerExpression, countAlias, distinctInnerExpression); var sumAlias = DerivedColumn.Get(DerivedColumnEnum.AVG_SUM_ALIAS).GetDerivedColumnAlias(aggregationAverageDerivedColumnCount); AggregationDistinctProjection sumDistinctProjection = new AggregationDistinctProjection(0, 0, AggregationTypeEnum.SUM, innerExpression, sumAlias, distinctInnerExpression); averageDistinctProjection.GetDerivedAggregationProjections().Add(countDistinctProjection); averageDistinctProjection.GetDerivedAggregationProjections().Add(sumDistinctProjection); aggregationAverageDerivedColumnCount++; }