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Exp for predicated joins #216

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@andrus

Currently, the only way to specify condition for predicated joins is via a JoinPredicate lambda. Let's provide a version of an expression-based Condition:

df.innerJoin()

   // here the expressions reference column names as they would appear 
   // in the resulting join to be able to address columns on both sides of the join
   .predicatedBy($decimal("salary").gt($decimal("salary_"))
   .with(df)

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