1980374 - [SAP IQ] Non-Fatal IQ Internal Error Detected at dflib/df_Heap.cxx:1416.

A simple query (which is using "IS" condition) failed to execute due to an internal error(dflib/df_Heap.cxx:1416).

[Query]

  SELECT  "pk", "c1", "c2"
    FROM  Test_TB
  WHERE  (( "c1" <= "c2" ) AND ("c1" != "c2" ) IS NOT TRUE ) IS TRUE

[Error]

********************************************************
**
**       Non-Fatal IQ Internal Error Detected
**       at dflib/df_Heap.cxx:1416  on thread 5655 (TID 3)
**       Error detected for expression: ((T11.c1 <= T11.c2) AND (NOT(((T11.c1 <> T11.c2) IS TRUE))))  (qb:0, addr:0x134bae6e8)
...
...
  
***************** This is the STACKTRACE ***************
...
...
.df_Heap::AddToHeap(df_Evaluable*,unsigned int)+0x1454()
.df_Heap::AddToHeap(opt_QueryExp*)+0xac()
.df_Heap::CreateDFPNode(void*,opt_QueryExp*)+0x25c()
.df_Heap::GenerateDF(void*,opt_QueryExp*)+0x370()
.opt_QueryTree::AttachQueryNodesRestrictions(opt_QueryNode*,QueryNode*,a_plist_node*)+0x98()
.opt_QueryTree::CreateNextQueryNode(opt_QueryNode*,QueryNode*)+0x4f0()
.opt_QueryTree::CreateNextQueryNode(opt_QueryNode*,QueryNode*)+0x4c0()
.opt_QueryTree::CreateQueryTree(QueryNode*)+0x300()
.opt_Select::GenerateDFEs(df_Heap*,opt_QueryExp*)+0x13c()
...
...
Exception Thrown from dflib/df_Heap.cxx:1416, Err# 0, tid 3 origtid 3
   O/S Err#: 0, ErrID: 9216 (df_Exception); SQLCode: -1006000, SQLState: 'QBA00', Severity: 23
[20238]: IQ Internal error. Please report this to Sybase IQ support.

SAP IQ 12.7 all, 15.4 all, less than 16sp08

IS TRUE, IS NOT TRUE, CR735108, df_Heap.cxx, internal error, Non-Fatal, CR 735108, 735108, CR #735108, AddToHeap , KBA , BC-SYB-IQ , Sybase IQ , BW-SYS-DB-IQ , BW on HANA with Sybase IQ Near-line Storage , Bug Filed