Rename the Boolean field trx->type to trx->is_purge

and remove the constants TRX_USER and TRX_PURGE.

include/trx0trx.h

@@ -402,7 +402,7 @@ struct trx_struct{
 	const char*	op_info;	/* English text describing the
 					current operation, or an empty
 					string */
-	ulint		type;		/* TRX_USER, TRX_PURGE */
+	unsigned	is_purge:1;	/* 0=user transaction, 1=purge */
 	ulint		conc_state;	/* state of the trx from the point
 					of view of concurrency control:
 					TRX_ACTIVE, TRX_COMMITTED_IN_MEMORY,
@@ -673,12 +673,6 @@ struct trx_struct{
 					single operation of a
 					transaction, e.g., a parallel
 					query */
-/* Transaction types */
-#define	TRX_USER		1	/* normal user transaction */
-#define	TRX_PURGE		2	/* purge transaction: this is not
-					inserted to the trx list of trx_sys
-					and no rollback segment is assigned to
-					this */
 /* Transaction concurrency states */
 #define	TRX_NOT_STARTED		1
 #define	TRX_ACTIVE		2

trx/trx0purge.c

@@ -221,7 +221,7 @@ trx_purge_sys_create(void)
 
 	purge_sys->trx = purge_sys->sess->trx;
 
-	purge_sys->trx->type = TRX_PURGE;
+	purge_sys->trx->is_purge = 1;
 
 	ut_a(trx_start_low(purge_sys->trx, ULINT_UNDEFINED));
 

trx/trx0trx.c

@@ -109,7 +109,7 @@ trx_create(
 
 	trx->op_info = "";
 
-	trx->type = TRX_USER;
+	trx->is_purge = 0;
 	trx->conc_state = TRX_NOT_STARTED;
 	trx->start_time = time(NULL);
 
@@ -667,7 +667,7 @@ trx_start_low(
 	ut_ad(mutex_own(&kernel_mutex));
 	ut_ad(trx->rseg == NULL);
 
-	if (trx->type == TRX_PURGE) {
+	if (trx->is_purge) {
 		trx->id = ut_dulint_zero;
 		trx->conc_state = TRX_ACTIVE;
 		trx->start_time = time(NULL);
@@ -1708,7 +1708,7 @@ trx_print(
 		fputs(trx->op_info, f);
 	}
 
-	if (trx->type != TRX_USER) {
+	if (trx->is_purge) {
 		fputs(" purge trx", f);
 	}