Transform map keys

Supported in: Batch, Streaming

Transforms keys of a map by applying an expression to every key-value pair.

Expression categories: Map

Declared arguments

• Expression to apply. - The expression to apply once per key-value pair of the map.
  Expression<K>
• Map - Map expression.
  Expression<Map<AnyType, V>>

Type variable bounds: K accepts AnyType**V accepts AnyType

Output type: Map<K, V>

Examples

Example 1: Base case

Argument values:

• Expression to apply.:
  stringBeforeDelimiter(
   delimiter: -,
   expression: key,
   ignoreCase: false,
  )
• Map: flight_number

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Example 2: Base case

Argument values:

• Expression to apply.:
  cast(
   expression: key,
   type: Integer,
  )
• Map: flight_number

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Example 3: Base case

Argument values:

• Expression to apply.:
  cast(
   expression: value,
   type: String,
  )
• Map: flight_number

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Example 4: Base case

Argument values:

• Expression to apply.:
  concatStrings(
   expressions: [
  stringBeforeDelimiter(
   delimiter: -,
   expression: key,
   ignoreCase: false,
  ), value],
   separator: -,
  )
• Map: flight_number

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