DPL Analysis: fix corner case in index builder algorithm (#13961)

Author: aalkin

Framework/Core/src/IndexBuilderHelpers.cxx

@@ -159,6 +159,10 @@ bool IndexColumnBuilder::findSingle(int idx)
     }
   }
 
+  if (mPosition < mSourceSize && valueAt(mPosition) < idx) {
+    ++mPosition;
+  }
+
   return (mPosition < mSourceSize && valueAt(mPosition) == idx);
 }
 
@@ -176,6 +180,10 @@ bool IndexColumnBuilder::findSlice(int idx)
     }
   }
 
+  if (mValuePos < mValuesArrow->length() && mValuesArrow->Value(mValuePos) <= idx) {
+    ++mPosition;
+  }
+
   return (mValuePos < mValuesArrow->length() && mValuesArrow->Value(mValuePos) == idx);
 }