NewConstNullOp creates a new operator that produces a constant (untyped) NULL value at index outputIdx.

NewConstOp creates a new operator that produces a constant value constVal of type t at index outputIdx.

NewOrderedDistinct creates a new ordered distinct operator on the given input columns with the given types.

NewOrdinalityOp returns a new WITH ORDINALITY operator.

NewSimpleProjectOp returns a new simpleProjectOp that applies a simple projection on the columns in its input batch, returning a new batch with only the columns in the projection slice, in order.

OrderedDistinctColsToOperators is a utility function that given an input and a slice of columns, creates a chain of distinct operators and returns the last distinct operator in that chain as well as its output column.

UpsertDistinctHelper is a utility that helps distinct operators emit errors when they observe duplicate tuples.