Add parse location fields to NullTest and BooleanTest structs.

We did not need a location tag on NullTest or BooleanTest before, because
no error messages referred directly to their locations.  That's planned
to change though, so add these fields in a separate housekeeping commit.

Catversion bump because stored rules may change.

src/backend/nodes/copyfuncs.c

@@ -1693,6 +1693,7 @@ _copyNullTest(const NullTest *from)
 	COPY_NODE_FIELD(arg);
 	COPY_SCALAR_FIELD(nulltesttype);
 	COPY_SCALAR_FIELD(argisrow);
+	COPY_LOCATION_FIELD(location);
 
 	return newnode;
 }
@@ -1707,6 +1708,7 @@ _copyBooleanTest(const BooleanTest *from)
 
 	COPY_NODE_FIELD(arg);
 	COPY_SCALAR_FIELD(booltesttype);
+	COPY_LOCATION_FIELD(location);
 
 	return newnode;
 }

src/backend/nodes/equalfuncs.c

@@ -622,6 +622,7 @@ _equalNullTest(const NullTest *a, const NullTest *b)
 	COMPARE_NODE_FIELD(arg);
 	COMPARE_SCALAR_FIELD(nulltesttype);
 	COMPARE_SCALAR_FIELD(argisrow);
+	COMPARE_LOCATION_FIELD(location);
 
 	return true;
 }
@@ -631,6 +632,7 @@ _equalBooleanTest(const BooleanTest *a, const BooleanTest *b)
 {
 	COMPARE_NODE_FIELD(arg);
 	COMPARE_SCALAR_FIELD(booltesttype);
+	COMPARE_LOCATION_FIELD(location);
 
 	return true;
 }

src/backend/nodes/nodeFuncs.c

@@ -1346,12 +1346,22 @@ exprLocation(const Node *expr)
 			}
 			break;
 		case T_NullTest:
-			/* just use argument's location */
-			loc = exprLocation((Node *) ((const NullTest *) expr)->arg);
+			{
+				const NullTest *nexpr = (const NullTest *) expr;
+
+				/* Much as above */
+				loc = leftmostLoc(nexpr->location,
+								  exprLocation((Node *) nexpr->arg));
+			}
 			break;
 		case T_BooleanTest:
-			/* just use argument's location */
-			loc = exprLocation((Node *) ((const BooleanTest *) expr)->arg);
+			{
+				const BooleanTest *bexpr = (const BooleanTest *) expr;
+
+				/* Much as above */
+				loc = leftmostLoc(bexpr->location,
+								  exprLocation((Node *) bexpr->arg));
+			}
 			break;
 		case T_CoerceToDomain:
 			{

src/backend/nodes/outfuncs.c

@@ -1370,6 +1370,7 @@ _outNullTest(StringInfo str, const NullTest *node)
 	WRITE_NODE_FIELD(arg);
 	WRITE_ENUM_FIELD(nulltesttype, NullTestType);
 	WRITE_BOOL_FIELD(argisrow);
+	WRITE_LOCATION_FIELD(location);
 }
 
 static void
@@ -1379,6 +1380,7 @@ _outBooleanTest(StringInfo str, const BooleanTest *node)
 
 	WRITE_NODE_FIELD(arg);
 	WRITE_ENUM_FIELD(booltesttype, BoolTestType);
+	WRITE_LOCATION_FIELD(location);
 }
 
 static void

src/backend/nodes/readfuncs.c

@@ -1044,6 +1044,7 @@ _readNullTest(void)
 	READ_NODE_FIELD(arg);
 	READ_ENUM_FIELD(nulltesttype, NullTestType);
 	READ_BOOL_FIELD(argisrow);
+	READ_LOCATION_FIELD(location);
 
 	READ_DONE();
 }
@@ -1058,6 +1059,7 @@ _readBooleanTest(void)
 
 	READ_NODE_FIELD(arg);
 	READ_ENUM_FIELD(booltesttype, BoolTestType);
+	READ_LOCATION_FIELD(location);
 
 	READ_DONE();
 }

src/backend/optimizer/plan/planagg.c

@@ -449,6 +449,7 @@ build_minmax_path(PlannerInfo *root, MinMaxAggInfo *mminfo,
 	ntest->arg = copyObject(mminfo->target);
 	/* we checked it wasn't a rowtype in find_minmax_aggs_walker */
 	ntest->argisrow = false;
+	ntest->location = -1;
 
 	/* User might have had that in WHERE already */
 	if (!list_member((List *) parse->jointree->quals, ntest))

src/backend/optimizer/prep/prepqual.c

@@ -212,6 +212,7 @@ negate_clause(Node *node)
 					newexpr->nulltesttype = (expr->nulltesttype == IS_NULL ?
 											 IS_NOT_NULL : IS_NULL);
 					newexpr->argisrow = expr->argisrow;
+					newexpr->location = expr->location;
 					return (Node *) newexpr;
 				}
 			}
@@ -247,6 +248,7 @@ negate_clause(Node *node)
 							 (int) expr->booltesttype);
 						break;
 				}
+				newexpr->location = expr->location;
 				return (Node *) newexpr;
 			}
 			break;

src/backend/optimizer/util/clauses.c

@@ -3305,6 +3305,7 @@ eval_const_expressions_mutator(Node *node,
 						newntest->arg = (Expr *) relem;
 						newntest->nulltesttype = ntest->nulltesttype;
 						newntest->argisrow = type_is_rowtype(exprType(relem));
+						newntest->location = ntest->location;
 						newargs = lappend(newargs, newntest);
 					}
 					/* If all the inputs were constants, result is TRUE */
@@ -3343,6 +3344,7 @@ eval_const_expressions_mutator(Node *node,
 				newntest->arg = (Expr *) arg;
 				newntest->nulltesttype = ntest->nulltesttype;
 				newntest->argisrow = ntest->argisrow;
+				newntest->location = ntest->location;
 				return (Node *) newntest;
 			}
 		case T_BooleanTest:
@@ -3395,6 +3397,7 @@ eval_const_expressions_mutator(Node *node,
 				newbtest = makeNode(BooleanTest);
 				newbtest->arg = (Expr *) arg;
 				newbtest->booltesttype = btest->booltesttype;
+				newbtest->location = btest->location;
 				return (Node *) newbtest;
 			}
 		case T_PlaceHolderVar:

src/backend/optimizer/util/plancat.c

@@ -720,6 +720,7 @@ get_relation_constraints(PlannerInfo *root,
 												  0);
 					ntest->nulltesttype = IS_NOT_NULL;
 					ntest->argisrow = type_is_rowtype(att->atttypid);
+					ntest->location = -1;
 					result = lappend(result, ntest);
 				}
 			}

src/backend/parser/gram.y

@@ -11299,6 +11299,7 @@ a_expr:		c_expr									{ $$ = $1; }
 					NullTest *n = makeNode(NullTest);
 					n->arg = (Expr *) $1;
 					n->nulltesttype = IS_NULL;
+					n->location = @2;
 					$$ = (Node *)n;
 				}
 			| a_expr ISNULL
@@ -11306,6 +11307,7 @@ a_expr:		c_expr									{ $$ = $1; }
 					NullTest *n = makeNode(NullTest);
 					n->arg = (Expr *) $1;
 					n->nulltesttype = IS_NULL;
+					n->location = @2;
 					$$ = (Node *)n;
 				}
 			| a_expr IS NOT NULL_P						%prec IS
@@ -11313,6 +11315,7 @@ a_expr:		c_expr									{ $$ = $1; }
 					NullTest *n = makeNode(NullTest);
 					n->arg = (Expr *) $1;
 					n->nulltesttype = IS_NOT_NULL;
+					n->location = @2;
 					$$ = (Node *)n;
 				}
 			| a_expr NOTNULL
@@ -11320,6 +11323,7 @@ a_expr:		c_expr									{ $$ = $1; }
 					NullTest *n = makeNode(NullTest);
 					n->arg = (Expr *) $1;
 					n->nulltesttype = IS_NOT_NULL;
+					n->location = @2;
 					$$ = (Node *)n;
 				}
 			| row OVERLAPS row
@@ -11343,6 +11347,7 @@ a_expr:		c_expr									{ $$ = $1; }
 					BooleanTest *b = makeNode(BooleanTest);
 					b->arg = (Expr *) $1;
 					b->booltesttype = IS_TRUE;
+					b->location = @2;
 					$$ = (Node *)b;
 				}
 			| a_expr IS NOT TRUE_P						%prec IS
@@ -11350,6 +11355,7 @@ a_expr:		c_expr									{ $$ = $1; }
 					BooleanTest *b = makeNode(BooleanTest);
 					b->arg = (Expr *) $1;
 					b->booltesttype = IS_NOT_TRUE;
+					b->location = @2;
 					$$ = (Node *)b;
 				}
 			| a_expr IS FALSE_P							%prec IS
@@ -11357,6 +11363,7 @@ a_expr:		c_expr									{ $$ = $1; }
 					BooleanTest *b = makeNode(BooleanTest);
 					b->arg = (Expr *) $1;
 					b->booltesttype = IS_FALSE;
+					b->location = @2;
 					$$ = (Node *)b;
 				}
 			| a_expr IS NOT FALSE_P						%prec IS
@@ -11364,6 +11371,7 @@ a_expr:		c_expr									{ $$ = $1; }
 					BooleanTest *b = makeNode(BooleanTest);
 					b->arg = (Expr *) $1;
 					b->booltesttype = IS_NOT_FALSE;
+					b->location = @2;
 					$$ = (Node *)b;
 				}
 			| a_expr IS UNKNOWN							%prec IS
@@ -11371,6 +11379,7 @@ a_expr:		c_expr									{ $$ = $1; }
 					BooleanTest *b = makeNode(BooleanTest);
 					b->arg = (Expr *) $1;
 					b->booltesttype = IS_UNKNOWN;
+					b->location = @2;
 					$$ = (Node *)b;
 				}
 			| a_expr IS NOT UNKNOWN						%prec IS
@@ -11378,6 +11387,7 @@ a_expr:		c_expr									{ $$ = $1; }
 					BooleanTest *b = makeNode(BooleanTest);
 					b->arg = (Expr *) $1;
 					b->booltesttype = IS_NOT_UNKNOWN;
+					b->location = @2;
 					$$ = (Node *)b;
 				}
 			| a_expr IS DISTINCT FROM a_expr			%prec IS

src/backend/parser/parse_expr.c

@@ -789,6 +789,7 @@ transformAExprOp(ParseState *pstate, A_Expr *a)
 		NullTest   *n = makeNode(NullTest);
 
 		n->nulltesttype = IS_NULL;
+		n->location = a->location;
 
 		if (exprIsNullConstant(lexpr))
 			n->arg = (Expr *) rexpr;

src/backend/rewrite/rewriteManip.c

@@ -1023,6 +1023,7 @@ AddInvertedQual(Query *parsetree, Node *qual)
 	invqual = makeNode(BooleanTest);
 	invqual->arg = (Expr *) qual;
 	invqual->booltesttype = IS_NOT_TRUE;
+	invqual->location = -1;
 
 	AddQual(parsetree, (Node *) invqual);
 }

src/include/catalog/catversion.h

@@ -53,6 +53,6 @@
  */
 
 /*							yyyymmddN */
-#define CATALOG_VERSION_NO	201502191
+#define CATALOG_VERSION_NO	201502221
 
 #endif

src/include/nodes/primnodes.h

@@ -1050,6 +1050,7 @@ typedef struct NullTest
 	Expr	   *arg;			/* input expression */
 	NullTestType nulltesttype;	/* IS NULL, IS NOT NULL */
 	bool		argisrow;		/* T if input is of a composite type */
+	int			location;		/* token location, or -1 if unknown */
 } NullTest;
 
 /*
@@ -1071,6 +1072,7 @@ typedef struct BooleanTest
 	Expr		xpr;
 	Expr	   *arg;			/* input expression */
 	BoolTestType booltesttype;	/* test type */
+	int			location;		/* token location, or -1 if unknown */
 } BooleanTest;
 
 /*