Case

Supported in: Batch, Streaming

Choose between different branches based on conditions.

Expression categories: Popular

Declared arguments

• Default: This value is chosen if all branches evaluate to false.
  Expression<T>
• optional Branches: Branches to evaluate before returning default value.
  List<Tuple<Expression<Boolean>, Expression<T>>>

Type variable bounds: T accepts AnyType

Output type: T

Examples

Example 1: Base case

Argument values:

• Default: Yes
• Branches: [(
  lessThan(
   left: miles,
   right: 15000,
  ), No)]

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Example 2: Edge case

Description: When multiple branches output decimals of differing types, we widen the type to fit all. Argument values:

• Default: decimalThree
• Branches: [(
  equals(
   left: value,
   right: 1,
  ), decimalOne), (
  equals(
   left: value,
   right: 2,
  ), decimalTwo)]

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Example 3: Edge case

Description: When the wider type is too large, we truncate the type and overflows become null. Argument values:

• Default: decimalThree
• Branches: [(
  equals(
   left: value,
   right: 1,
  ), decimalOne), (
  equals(
   left: value,
   right: 2,
  ), decimalTwo)]

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