Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/11696#discussion_r56498078
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/SQLBuilder.scala ---
@@ -221,6 +224,42 @@ class SQLBuilder(logicalPlan: LogicalPlan, sqlContext:
SQLContext) extends Loggi
)
}
+ private def generateToSQL(g: Generate): String = {
+ val columnAliases = g.generatorOutput.map(_.sql).mkString(",")
+
+ val childSQL = if (g.child == OneRowRelation) {
+ // This only happens when we put UDTF in project list and there is
no FROM clause. Because we
+ // always generate LATERAL VIEW for `Generate`, here we use a trick
to put a dummy sub-query
+ // after FROM clause, so that we can generate a valid LATERAL VIEW
SQL string.
+ // For example, if the original SQL is: "SELECT EXPLODE(ARRAY(1,
2))", we will convert in to
+ // LATERAL VIEW format, and generate:
+ // SELECT col FROM (SELECT 1) sub-q0 LATERAL VIEW EXPLODE(ARRAY(1,
2)) sub_q1 AS col
--- End diff --
Nit: `sub-q0` => `sub_q0`
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