"IN/EXISTS predicate sub-queries can only be used in a Filter:" Code Answer's
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IN/EXISTS predicate sub-queries can only be used in a Filter:
import sparkSession.implicits._
Seq("france").toDF("country").createOrReplaceTempView("countries")
Seq(("user1", "france"), ("user2", "italy"), ("user2", "usa"))
.toDF("user", "country").createOrReplaceTempView("users")
val query =
s"""
|SELECT
| CASE
| WHEN u.country = 'italy' THEN 'Italy'
| ELSE (
| CASE
| WHEN u.country = c.country THEN upper(u.country)
| ELSE u.country
| END
| ) END AS country
|FROM users u
|LEFT JOIN countries c
| ON u.country = c.country
""".stripMargin
sparkSession.sql(query).show()
Source: stackoverflow.com
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