org.apache.calcite.tools

Interface RelBuilder.OverCall

Enclosing class:

RelBuilder

public static interface RelBuilder.OverCall

Call to a windowed aggregate function.

To create an OverCall, start with an RelBuilder.AggCall (created by a method such as RelBuilder.aggregateCall(org.apache.calcite.sql.SqlAggFunction, boolean, org.apache.calcite.rex.RexNode, java.lang.String, org.apache.calcite.rex.RexNode...), RelBuilder.sum(org.apache.calcite.rex.RexNode) or RelBuilder.count(org.apache.calcite.rex.RexNode...)) and call its RelBuilder.AggCall.over() method. For example,

 b.scan("EMP")
    .project(b.field("DEPTNO"),
       b.aggregateCall(SqlStdOperatorTable.ROW_NUMBER)
          .over()
          .partitionBy()
          .orderBy(b.field("EMPNO"))
          .rowsUnbounded()
          .allowPartial(true)
          .nullWhenCountZero(false)
          .as("x"))
 

Unlike an aggregate call, a windowed aggregate call is an expression that you can use in a Project or Filter. So, to finish, call toRex() to convert the OverCall to a RexNode; the as(java.lang.String) method (used in the above example) does the same but also assigns an column alias.

Method Summary

Modifier and Type	Method and Description
RelBuilder.OverCall	allowPartial(boolean allowPartial) Sets whether to allow partial width windows; default true.
org.apache.calcite.rex.RexNode	as(String alias) Sets the alias of this expression, and converts it to a RexNode; default is the alias that was set via RelBuilder.AggCall.as(String).
default <R> R	let(Function<RelBuilder.OverCall,R> consumer) Performs an action on this OverCall.
RelBuilder.OverCall	nullWhenCountZero(boolean nullWhenCountZero) Sets whether the aggregate function should evaluate to null if no rows are in the window; default false.
RelBuilder.OverCall	orderBy(Iterable<? extends org.apache.calcite.rex.RexNode> expressions) Sets the ORDER BY BY clause to a list of expressions.
RelBuilder.OverCall	orderBy(org.apache.calcite.rex.RexNode... expressions) Sets the ORDER BY BY clause to an array of expressions.
RelBuilder.OverCall	partitionBy(Iterable<? extends org.apache.calcite.rex.RexNode> expressions) Sets the PARTITION BY clause to a list of expressions.
RelBuilder.OverCall	partitionBy(org.apache.calcite.rex.RexNode... expressions) Sets the PARTITION BY clause to an array of expressions.
RelBuilder.OverCall	rangeBetween(org.apache.calcite.rex.RexWindowBound lower, org.apache.calcite.rex.RexWindowBound upper) Sets a RANGE window with lower and upper bounds, equivalent to SQL RANGE BETWEEN lower ROW AND upper.
default RelBuilder.OverCall	rangeFrom(org.apache.calcite.rex.RexWindowBound lower) Sets a RANGE window with a lower bound, equivalent to SQL RANGE BETWEEN lower AND CURRENT ROW.
default RelBuilder.OverCall	rangeTo(org.apache.calcite.rex.RexWindowBound upper) Sets a RANGE window with an upper bound, equivalent to SQL RANGE BETWEEN CURRENT ROW AND upper.
default RelBuilder.OverCall	rangeUnbounded() Sets an unbounded RANGE window, equivalent to SQL RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING.
RelBuilder.OverCall	rowsBetween(org.apache.calcite.rex.RexWindowBound lower, org.apache.calcite.rex.RexWindowBound upper) Sets a RANGE window with lower and upper bounds, equivalent to SQL ROWS BETWEEN lower ROW AND upper.
default RelBuilder.OverCall	rowsFrom(org.apache.calcite.rex.RexWindowBound lower) Sets a ROWS window with a lower bound, equivalent to SQL ROWS BETWEEN lower AND CURRENT ROW.
default RelBuilder.OverCall	rowsTo(org.apache.calcite.rex.RexWindowBound upper) Sets a ROWS window with an upper bound, equivalent to SQL ROWS BETWEEN CURRENT ROW AND upper.
default RelBuilder.OverCall	rowsUnbounded() Sets an unbounded ROWS window, equivalent to SQL ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING.
org.apache.calcite.rex.RexNode	toRex() Converts this expression to a RexNode.

Method Detail

let

default <R> R let(Function<RelBuilder.OverCall,R> consumer)

Performs an action on this OverCall.

partitionBy

RelBuilder.OverCall partitionBy(org.apache.calcite.rex.RexNode... expressions)

Sets the PARTITION BY clause to an array of expressions.

partitionBy

RelBuilder.OverCall partitionBy(Iterable<? extends org.apache.calcite.rex.RexNode> expressions)

Sets the PARTITION BY clause to a list of expressions.

orderBy

RelBuilder.OverCall orderBy(org.apache.calcite.rex.RexNode... expressions)

Sets the ORDER BY BY clause to an array of expressions.

Use RelBuilder.desc(RexNode), RelBuilder.nullsFirst(RexNode), RelBuilder.nullsLast(RexNode) to control the sort order.

orderBy

RelBuilder.OverCall orderBy(Iterable<? extends org.apache.calcite.rex.RexNode> expressions)

Sets the ORDER BY BY clause to a list of expressions.

Use RelBuilder.desc(RexNode), RelBuilder.nullsFirst(RexNode), RelBuilder.nullsLast(RexNode) to control the sort order.

rowsUnbounded

default RelBuilder.OverCall rowsUnbounded()

Sets an unbounded ROWS window, equivalent to SQL ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING.

rowsFrom

default RelBuilder.OverCall rowsFrom(org.apache.calcite.rex.RexWindowBound lower)

Sets a ROWS window with a lower bound, equivalent to SQL ROWS BETWEEN lower AND CURRENT ROW.

rowsTo

default RelBuilder.OverCall rowsTo(org.apache.calcite.rex.RexWindowBound upper)

Sets a ROWS window with an upper bound, equivalent to SQL ROWS BETWEEN CURRENT ROW AND upper.

rowsBetween

RelBuilder.OverCall rowsBetween(org.apache.calcite.rex.RexWindowBound lower,
                                org.apache.calcite.rex.RexWindowBound upper)

Sets a RANGE window with lower and upper bounds, equivalent to SQL ROWS BETWEEN lower ROW AND upper.

rangeUnbounded

default RelBuilder.OverCall rangeUnbounded()

Sets an unbounded RANGE window, equivalent to SQL RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING.

rangeFrom

default RelBuilder.OverCall rangeFrom(org.apache.calcite.rex.RexWindowBound lower)

Sets a RANGE window with a lower bound, equivalent to SQL RANGE BETWEEN lower AND CURRENT ROW.

rangeTo

default RelBuilder.OverCall rangeTo(org.apache.calcite.rex.RexWindowBound upper)

Sets a RANGE window with an upper bound, equivalent to SQL RANGE BETWEEN CURRENT ROW AND upper.

rangeBetween

RelBuilder.OverCall rangeBetween(org.apache.calcite.rex.RexWindowBound lower,
                                 org.apache.calcite.rex.RexWindowBound upper)

Sets a RANGE window with lower and upper bounds, equivalent to SQL RANGE BETWEEN lower ROW AND upper.

allowPartial

RelBuilder.OverCall allowPartial(boolean allowPartial)

Sets whether to allow partial width windows; default true.

nullWhenCountZero

RelBuilder.OverCall nullWhenCountZero(boolean nullWhenCountZero)

Sets whether the aggregate function should evaluate to null if no rows are in the window; default false.

as

org.apache.calcite.rex.RexNode as(String alias)

Sets the alias of this expression, and converts it to a RexNode; default is the alias that was set via RelBuilder.AggCall.as(String).

toRex

org.apache.calcite.rex.RexNode toRex()

Converts this expression to a RexNode.