Make naming of tupdesc related structs more consistent with the rest of PG.

We usually don't change the name of structs between the struct name
itself and the name of the typedef. Additionally, structs that are
usually used via a typedef that hides being a pointer, are commonly
suffixed Data.  Change tupdesc code to follow those convention.

This is triggered by a future patch that intends to forward declare
TupleDescData in another header - keeping with the naming scheme makes
that easier to understand.

Author: Andres Freund
Discussion: https://postgr.es/m/20190114000701.y4ttcb74jpskkcfb@alap3.anarazel.de

src/backend/access/common/tupdesc.c

@@ -63,7 +63,7 @@ CreateTemplateTupleDesc(int natts)
 	 * could be less due to trailing padding, although with the current
 	 * definition of pg_attribute there probably isn't any padding.
 	 */
-	desc = (TupleDesc) palloc(offsetof(struct tupleDesc, attrs) +
+	desc = (TupleDesc) palloc(offsetof(struct TupleDescData, attrs) +
 							  natts * sizeof(FormData_pg_attribute));
 
 	/*

src/backend/jit/llvm/llvmjit.c

@@ -63,7 +63,7 @@ LLVMTypeRef StructItemPointerData;
 LLVMTypeRef StructBlockId;
 LLVMTypeRef StructFormPgAttribute;
 LLVMTypeRef StructTupleConstr;
-LLVMTypeRef StructtupleDesc;
+LLVMTypeRef StructTupleDescData;
 LLVMTypeRef StructTupleTableSlot;
 LLVMTypeRef StructHeapTupleTableSlot;
 LLVMTypeRef StructMinimalTupleTableSlot;
@@ -816,7 +816,7 @@ llvm_create_types(void)
 	StructHeapTupleTableSlot = load_type(mod, "StructHeapTupleTableSlot");
 	StructMinimalTupleTableSlot = load_type(mod, "StructMinimalTupleTableSlot");
 	StructHeapTupleData = load_type(mod, "StructHeapTupleData");
-	StructtupleDesc = load_type(mod, "StructtupleDesc");
+	StructTupleDescData = load_type(mod, "StructTupleDescData");
 	StructAggState = load_type(mod, "StructAggState");
 	StructAggStatePerGroupData = load_type(mod, "StructAggStatePerGroupData");
 	StructAggStatePerTransData = load_type(mod, "StructAggStatePerTransData");

src/backend/jit/llvm/llvmjit_types.c

@@ -61,7 +61,7 @@ MemoryContextData StructMemoryContextData;
 TupleTableSlot StructTupleTableSlot;
 HeapTupleTableSlot StructHeapTupleTableSlot;
 MinimalTupleTableSlot StructMinimalTupleTableSlot;
-struct tupleDesc StructtupleDesc;
+TupleDescData StructTupleDescData;
 
 
 /*

src/include/access/tupdesc.h

@@ -19,13 +19,13 @@
 #include "nodes/pg_list.h"
 
 
-typedef struct attrDefault
+typedef struct AttrDefault
 {
 	AttrNumber	adnum;
 	char	   *adbin;			/* nodeToString representation of expr */
 } AttrDefault;
 
-typedef struct constrCheck
+typedef struct ConstrCheck
 {
 	char	   *ccname;
 	char	   *ccbin;			/* nodeToString representation of expr */
@@ -34,11 +34,11 @@ typedef struct constrCheck
 } ConstrCheck;
 
 /* This structure contains constraints of a tuple */
-typedef struct tupleConstr
+typedef struct TupleConstr
 {
 	AttrDefault *defval;		/* array */
 	ConstrCheck *check;			/* array */
-	struct attrMissing *missing;		/* missing attributes values, NULL if none */
+	struct AttrMissing *missing;		/* missing attributes values, NULL if none */
 	uint16		num_defval;
 	uint16		num_check;
 	bool		has_not_null;
@@ -75,7 +75,7 @@ typedef struct tupleConstr
  * field of such a descriptor to -1, while reference-counted descriptors
  * always have tdrefcount >= 0.
  */
-typedef struct tupleDesc
+typedef struct TupleDescData
 {
 	int			natts;			/* number of attributes in the tuple */
 	Oid			tdtypeid;		/* composite type ID for tuple type */
@@ -84,7 +84,8 @@ typedef struct tupleDesc
 	TupleConstr *constr;		/* constraints, or NULL if none */
 	/* attrs[N] is the description of Attribute Number N+1 */
 	FormData_pg_attribute attrs[FLEXIBLE_ARRAY_MEMBER];
-}		   *TupleDesc;
+} TupleDescData;
+typedef struct TupleDescData *TupleDesc;
 
 /* Accessor for the i'th attribute of tupdesc. */
 #define TupleDescAttr(tupdesc, i) (&(tupdesc)->attrs[(i)])
@@ -98,7 +99,7 @@ extern TupleDesc CreateTupleDescCopy(TupleDesc tupdesc);
 extern TupleDesc CreateTupleDescCopyConstr(TupleDesc tupdesc);
 
 #define TupleDescSize(src) \
-	(offsetof(struct tupleDesc, attrs) + \
+	(offsetof(struct TupleDescData, attrs) + \
 	 (src)->natts * sizeof(FormData_pg_attribute))
 
 extern void TupleDescCopy(TupleDesc dst, TupleDesc src);

src/include/access/tupdesc_details.h

@@ -19,7 +19,7 @@
  * Structure used to represent value to be used when the attribute is not
  * present at all in a tuple, i.e. when the column was created after the tuple
  */
-typedef struct attrMissing
+typedef struct AttrMissing
 {
 	bool		am_present;		/* true if non-NULL missing value exists */
 	Datum		am_value;		/* value when attribute is missing */

src/include/jit/llvmjit.h

@@ -62,7 +62,7 @@ extern LLVMTypeRef TypePGFunction;
 extern LLVMTypeRef TypeSizeT;
 extern LLVMTypeRef TypeStorageBool;
 
-extern LLVMTypeRef StructtupleDesc;
+extern LLVMTypeRef StructTupleDescData;
 extern LLVMTypeRef StructHeapTupleData;
 extern LLVMTypeRef StructTupleTableSlot;
 extern LLVMTypeRef StructHeapTupleTableSlot;