public class BeamSqlWindowExpression extends BeamSqlExpression
BeamSqlExpression
for HOP
, TUMBLE
, SESSION
operation.
These functions don't change the timestamp field, instead it's used to indicate the event_timestamp field, and how the window is defined.
operands, outputType
Constructor and Description |
---|
BeamSqlWindowExpression(java.util.List<BeamSqlExpression> operands,
org.apache.calcite.sql.type.SqlTypeName outputType) |
Modifier and Type | Method and Description |
---|---|
boolean |
accept()
assertion to make sure the input and output are supported in this expression.
|
BeamSqlPrimitive<ReadableInstant> |
evaluate(Row inputRow,
BoundedWindow window,
BeamSqlExpressionEnvironment env)
Apply input record
Row with BoundedWindow to this expression, the output value
is wrapped with BeamSqlPrimitive . |
getOperands, getOutputType, numberOfOperands, op, opType, opValueEvaluated
public BeamSqlWindowExpression(java.util.List<BeamSqlExpression> operands, org.apache.calcite.sql.type.SqlTypeName outputType)
public boolean accept()
BeamSqlExpression
accept
in class BeamSqlExpression
public BeamSqlPrimitive<ReadableInstant> evaluate(Row inputRow, BoundedWindow window, BeamSqlExpressionEnvironment env)
BeamSqlExpression
Row
with BoundedWindow
to this expression, the output value
is wrapped with BeamSqlPrimitive
.evaluate
in class BeamSqlExpression