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();
 }