fix: TypeError for empty list (#1269)

Co-authored-by: Bob den Os <[email protected]>

Author: David-Kunz

db-service/lib/cqn2sql.js

@@ -324,7 +324,7 @@ class CQN2SQLRenderer {
       DistanceFromRoot: { xpr: [{ ref: ['HIERARCHY_LEVEL'] }, '-', { val: 1, param: false }], as: 'DistanceFromRoot' },
       DrillState: false,
       LimitedDescendantCount: { xpr: [{ ref: ['HIERARCHY_TREE_SIZE'] }, '-', { val: 1, param: false }], as: 'LimitedDescendantCount' },
-      LimitedRank: { xpr: [{ func: 'row_number', args: [], xpr: ['OVER', { list: [] }] }, '-', { val: 1, param: false }], as: 'LimitedRank' }
+      LimitedRank: { xpr: [{ func: 'row_number', args: [] }, 'OVER', { xpr: [] }, '-', { val: 1, param: false }], as: 'LimitedRank' }
     }
 
     const columnsFiltered = columns

hana/lib/HANAService.js

@@ -1145,7 +1145,7 @@ SELECT ${mixing} FROM JSON_TABLE(SRC.JSON, '$' COLUMNS(${extraction}) ERROR ON E
     list(list) {
       const first = list.list[0]
       // If the list only contains of lists it is replaced with a json function and a placeholder
-      if (this.values && first.list && !first.list.find(v => v.val == null)) {
+      if (this.values && first?.list && !first.list.find(v => v.val == null)) {
         const listMapped = []
         for (let l of list.list) {
           const obj = {}
@@ -1163,7 +1163,7 @@ SELECT ${mixing} FROM JSON_TABLE(SRC.JSON, '$' COLUMNS(${extraction}) ERROR ON E
         return `(SELECT * FROM JSON_TABLE(?, '$' COLUMNS(${extraction})))`
       }
       // If the list only contains of vals it is replaced with a json function and a placeholder
-      if (this.values && first.val != null) {
+      if (this.values && first?.val != null) {
         for (let c of list.list) {
           if (Buffer.isBuffer(c.val)) {
             return super.list(list)