fix join hanging (#1380)

Author: yliuuuu

partiql-eval/src/main/kotlin/org/partiql/eval/internal/operator/rel/RelJoinNestedLoop.kt

@@ -54,6 +54,8 @@ internal abstract class RelJoinNestedLoop : Operator.Relation {
                 val result = condition.eval(input)
                 toReturn = join(result.isTrue(), lhsRecord!!, rhsRecord!!)
             }
+            // Move the pointer to the next row for the RHS
+            if (toReturn == null) rhsRecord = rhs.next()
         }
         while (toReturn == null)
         return toReturn

partiql-planner/src/main/kotlin/org/partiql/planner/internal/transforms/Symbols.kt

@@ -49,7 +49,8 @@ internal class Symbols private constructor() {
         var j = 0
         while (j < c.items.size) {
             if (c.items[j] == item) {
-                break
+                // Found existing item in catalog, return the ref
+                return CatalogRef(i, j)
             }
             j++
         }