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Important
This feature is in Public Preview. You can confirm preview enrollment on the Previews page. See Manage Azure Databricks previews.
Applies to: 
Databricks SQL Databricks Runtime 16.1 and above
Returns the collation attached to strExpr.
Syntax
collation (strExpr)
Arguments
strExpr: ASTRINGexpression.
Returns
A STRING using default collation, with the collation name.
Examples
> SELECT collation('test');
UTF8_BINARY