t

zio.sql

GroupByUtilsModule

trait GroupByUtilsModule extends AnyRef

User lands in this builder in case there is a "partial aggregation" in a query like:

select Count(id), customer_id from orders group by customer_id

In such a case its not possible to execute query before we group by customer_id. As we need to check F of every Expr, groupBy method is overloaded by 22 arities - even though partically, mostly only few are necessary.

Without group by clause, AggSelectBuilderGroupBy is not executable so calling groupBy is the only choice. The query won't compile unless user groups at least by required columns.

In case we are not dealing with partial aggregation, this builder is skipped and user can groupBy in Read.Subselect as usual. Following are all valid examples of queries not using this AggSelectBuilderGroupBy trait.

select Count(id) from orders group by customer_id

select Count(id) from orders

select customer_id from orders group by customer_id

select customer_id from orders group by customer_id

Self Type
GroupByUtilsModule with SelectModule with ExprModule
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Sql
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Type Members

  1. sealed case class AggSelectBuilderGroupBy[F, Repr, Source, Head, Tail <: (GroupByUtilsModule.this)#SelectionSet[Source], Unaggregated](select: Select[F, Repr, Source, Head, Tail]) extends Product with Serializable

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