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1.1 (stable)
Union Functions
Name Description
union.tag Dot notation serves as an alias for union_extract.
union_extract(union, 'tag') Extract the value with the named tags from the union. NULL if the tag is not currently selected.
union_value(tag := any) Create a single member UNION containing the argument value. The tag of the value will be the bound variable name.
union_tag(union) Retrieve the currently selected tag of the union as an Enum.

union.tag

Description Dot notation serves as an alias for union_extract.
Example (union_value(k := 'hello')).k
Result string

union_extract(union, 'tag')

Description Extract the value with the named tags from the union. NULL if the tag is not currently selected.
Example union_extract(s, 'k')
Result hello

union_value(tag := any)

Description Create a single member UNION containing the argument value. The tag of the value will be the bound variable name.
Example union_value(k := 'hello')
Result 'hello'::UNION(k VARCHAR)

union_tag(union)

Description Retrieve the currently selected tag of the union as an Enum.
Example union_tag(union_value(k := 'foo'))
Result 'k'
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