Package io.delta.kernel.expressions

Class ScalarExpression

Object
io.delta.kernel.expressions.ScalarExpression
All Implemented Interfaces:
Expression
Direct Known Subclasses:
Predicate
@Evolving public class ScalarExpression extends Object implements Expression
Scalar SQL expressions which take zero or more inputs and for each input row generate one output value. A subclass of these expressions are of type Predicate whose result type is `boolean`. See Predicate for predicate type scalar expressions. Supported non-predicate type scalar expressions are listed below.
  1. Name: element_at
    • Semantic: element_at(map, key). Return the value of given key from the map type input. Returns null if the given key is not in the map Ex: `element_at(map(1, 'a', 2, 'b'), 2)` returns 'b'
    • Since version: 3.0.0
  2. Name: COALESCE
    • Semantic: COALESCE(expr1, ..., exprN) Return the first non-null argument. If all arguments are null returns null
    • Since version: 3.1.0
Since:
3.0.0