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
aliasNis specified, the field is namedaliasN. - If
exprNis a named reference, such as a column name, the field name is that name. - Otherwise, the fields are named
colN, whereNis the position of the field in the struct.
Examples
SQL
> 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}