Jaa

try_variant_get function

  • Artikkeli

Applies to: check marked yes Databricks SQL check marked yes Databricks Runtime 15.3 and later

Extracts a value of type type from variantExpr, specified by path, or NULL if it is not possible to cast to the target type.

Syntax

try_variant_get ( variantExpr, path, type )

Arguments

  • variantExpr: A VARIANT expression.
  • path: A STRING literal with a well-formed JSON path expression.
  • type: A STRING literal defining the type.

Returns

A value of type type.

If the object cannot be found or it cannot be cast to type, NULL is returned. To raise an error when the cast fails use variant_get.

Examples

-- Simple example
> SELECT try_variant_get(parse_json('{"key": 123, "data": [4, {"a": "hello"}, "str"]}'), '$.data[1].a', 'string')
  hello

-- missing path
> SELECT try_variant_get(parse_json('{"key": 123, "data": [4, {"a": "hello"}, "str"]}'), '$.missing', 'int')
  null

-- Invalid cast
> SELECT try_variant_get(parse_json('{"key": 123, "data": [4, {"a": "hello"}, "str"]}'), '$.key', 'array<int>')
  null