Case sensitive and Case insensitive in spark Data Frames

While working on spark Dataframe in spark, I found some useful insights about case sensitive and case insensitive.

1. col(“column name”)

Here column name is case sensitive, Here follows the code below

2. dataframe.<column name>

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Here Column name is case insensitive

Here Fname is different what i defined in spark data frame(FNAME)

Here, If I tried to provided irrespective of column names in dataframe.<column name> it will throws error, be cautious about case insensitive

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Dmytro Iakubovskyi:FYI