struct function

Applies to: Databricks SQL Databricks Runtime

Creates a STRUCT with the specified field values.

Syntax

struct(expr1 [[AS] alias1] ) [, ...] )

Arguments

• exprN: An expression of any type.
• aliasN: An optional alias for the field.

Returns

A struct with fieldN matching the type of exprN.

The field names are determined by the following rules:

• If aliasN is specified, the field is named aliasN.
• If exprN is a named reference, such as a column name, the field name is that name.
• Otherwise, the fields are named colN, where N is the position of the field in the struct.

Examples

> SELECT struct(c1, c2, c3) FROM VALUES(1, 2, 3) AS T(c1, c2, c3);
 {"c1":1,"c2":2,"c3":3}

> SELECT struct(1, 2 AS two, 3);
 {"col1":1,"two":2,"col3":3}

Related functions

• named_struct function
• map function
• str_to_map function