commit 0d6619694bb4c20b9f006d5f71af61d5ddb4c2d7
Author: Mahendra Singh Thalor <mahi6run@gmail.com>
Date:   Mon Jan 6 18:14:40 2020 +0530

    Added table name in "not-null constrain" error

diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 1c4394a..c683673 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -5007,8 +5007,9 @@ ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap, LOCKMODE lockmode)
 
 					ereport(ERROR,
 							(errcode(ERRCODE_NOT_NULL_VIOLATION),
-							 errmsg("column \"%s\" contains null values",
-									NameStr(attr->attname)),
+							 errmsg("column \"%s\" of relation \"%s\" contains null values",
+									NameStr(attr->attname),
+									RelationGetRelationName(oldrel)),
 							 errtablecol(oldrel, attn + 1)));
 				}
 			}
diff --git a/src/backend/executor/execMain.c b/src/backend/executor/execMain.c
index 4181a7e..f787ead 100644
--- a/src/backend/executor/execMain.c
+++ b/src/backend/executor/execMain.c
@@ -1957,8 +1957,9 @@ ExecConstraints(ResultRelInfo *resultRelInfo,
 
 				ereport(ERROR,
 						(errcode(ERRCODE_NOT_NULL_VIOLATION),
-						 errmsg("null value in column \"%s\" violates not-null constraint",
-								NameStr(att->attname)),
+						 errmsg("null value in column \"%s\" of relation \"%s\" violates not-null constraint",
+								NameStr(att->attname),
+								RelationGetRelationName(orig_rel)),
 						 val_desc ? errdetail("Failing row contains %s.", val_desc) : 0,
 						 errtablecol(orig_rel, attrChk)));
 			}