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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