Github user culler commented on a diff in the pull request:
https://github.com/apache/spark/pull/3066#discussion_r19730958
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/dsl/package.scala ---
@@ -146,6 +146,31 @@ package object dsl {
def upper(e: Expression) = Upper(e)
def lower(e: Expression) = Lower(e)
+ /*
+ * Conversions to provide the standard operators in the special case
+ * where a literal is being combined with a symbol. Without these an
+ * expression such as 0 < 'x is not recognized.
+ */
+ implicit class InitialLiteral(x: Any) {
+ val literal = Literal(x)
+ def + (other: Symbol):Expression = {literal + other}
+ def - (other: Symbol):Expression = {literal - other}
+ def * (other: Symbol):Expression = {literal * other}
+ def / (other: Symbol):Expression = {literal / other}
+ def % (other: Symbol):Expression = {literal % other}
+
+ def && (other: Symbol):Expression = {literal && other}
+ def || (other: Symbol):Expression = {literal || other}
+
+ def < (other: Symbol):Expression = {literal < other}
+ def <= (other: Symbol):Expression = {literal <= other}
+ def > (other: Symbol):Expression = {literal > other}
+ def >= (other: Symbol):Expression = {literal >= other}
+ def === (other: Symbol):Expression = {literal === other}
+ def <=> (other: Symbol):Expression = {literal <=> other}
+ def !== (other: Symbol):Expression = {literal !== other}
--- End diff --
Thanks.
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