Map values

Supported in: Batch, Streaming

Changes the values of the input column to new values based on a map of key-value pairs. If the input value is not found in the map, the default value is used.

Expression categories: Data preparation

Declared arguments

• Column to replace values in: Column containing the initial values to be mapped to new values.
  Expression<T1>
• Default value: The default value to be added to the output column if the input value is not found in the map.
  Expression<T2>
• Values map: Map consisting of key-value pairs. The key of the map is the original value found in the input to be mapped to a new one, whereas the value of the map represents the new value to be replaced with.
  Expression<Map<T1, T2>>

Type variable bounds: T1 accepts ComparableType**T2 accepts AnyType

Output type: T2

Examples

Example 1: Base case

Argument values:

• Column to replace values in: country
• Default value:
  cast(
   expression: null,
   type: String,
  )
• Values map: {
   Denmark -> DNK,
   United Kingdom -> UK,
  }

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Example 2: Base case

Argument values:

• Column to replace values in: country
• Default value: country
• Values map: {
   United Kingdom -> null,
  }

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Example 3: Base case

Argument values:

• Column to replace values in: country
• Default value: country
• Values map: {
   Denmark -> DNK,
   United Kingdom -> null,
  }

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Example 4: Null case

Argument values:

• Column to replace values in: country
• Default value: country
• Values map: {
   United Kingdom -> UK,
  }

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