Spark SQL - Pre-defined Functions - Data Type Conversion

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Let us understand how we can type cast to change the data type of extracted value to its original type.

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One issue m facing in spark
How to convert String column into varchar, it is a requirement to make in sync the schema with postgres table.

I saw in spark 3.1 it has but m unable to achieve it.

Can u pls help me to solve my this issue with running one line of code

sachinupadhyay