Hi all,
I wanted to join the data frame based on spark sql in IntelliJ, and wrote
these code lines as below:
df1.as('first).join(df2.as('second), $"first._1" === $"second._1")
IntelliJ reported the error for $ and === in red colour.
I found $ and === are defined as implicit conversion in
org.apache.spark.sql.catalyst.dsl.ExpressionConversions and
org.apache.spark.sql.catalyst.dsl.ImplicitOperators, so I was trying to
import them to solve the issue, however, it doesn't work.
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