Description Usage Arguments Note See Also
If values in the specified column are null, returns the value.
Can be used in conjunction with when to specify a default value for expressions.
| 1 2 3 4 | 
| x | a Column. | 
| value | value to replace when the corresponding entry in  | 
otherwise since 1.5.0
Other column_func: 
alias(),
between(),
cast(),
endsWith(),
over(),
startsWith(),
substr()
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