object QueryAggregations extends Logging
Helper object to deal with aggregations in N1QL/SQL++.
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- def aggregateAliases(schema: StructType, aggregations: Option[Aggregation]): Seq[Option[String]]
Pushed-down aggregates appear in the schema under their expression, e.g.
Pushed-down aggregates appear in the schema under their expression, e.g. "MIN(
price)". The query result can't use that as a field name: without an alias the query service names them "$1", "$2" and so on. So each aggregate is given an alias in the SELECT, and rows are parsed against a schema renamed to match (see resultSchema). Parsed rows are positional, so Spark still sees the original column names.- returns
for each field of the schema, its alias if it is an aggregate, or None if it is a group-by column or there are no pushed-down aggregates.
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- def convertAggregateExpressions(agg: Aggregation, schema: StructType): Seq[StructField]
Converts a spark aggregation into a sequence of fields.
Converts a spark aggregation into a sequence of fields. If empty the aggregation is not supported or something else went wrong.
- agg
the aggregation to convert.
- returns
a non-empty sequence if supported and present.
- def convertGroupByExpression(agg: Aggregation, schema: StructType): Seq[StructField]
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- def groupByColumnNames(aggregations: Option[Aggregation]): Seq[String]
The names of the group-by columns of a pushed-down aggregation.
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- def resultSchema(schema: StructType, aggregations: Option[Aggregation]): StructType
The schema of the rows returned by the query: the read schema with aggregates renamed to their aliases.
- def selectTerm(escapedField: String, alias: Option[String]): String
A SELECT term for an already-escaped field, aliased if required.
- def supportsCompleteAggPushdown(agg: Aggregation): Boolean
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- Deprecated
(Since version 9)