rem0cmp.c, data0type.c, data0type.ic, data0type.h, ha_innodb.cc:

  Remove the now redundant flag DATA_NONLATIN1; better comments


sql/ha_innodb.cc:
  Remove the now redundant flag DATA_NONLATIN1; better comments
innobase/include/data0type.h:
  Remove the now redundant flag DATA_NONLATIN1; better comments
innobase/include/data0type.ic:
  Remove the now redundant flag DATA_NONLATIN1; better comments
innobase/data/data0type.c:
  Remove the now redundant flag DATA_NONLATIN1; better comments
innobase/rem/rem0cmp.c:
  Remove the now redundant flag DATA_NONLATIN1; better comments

innobase/data/data0type.c

@@ -18,8 +18,9 @@ column definitions, or records in the insert buffer, we use this
 charset-collation code for them. */
 
 ulint	data_mysql_default_charset_coll		= 99999999;
+ulint	data_mysql_latin1_swedish_charset_coll	= 99999999;
 
-dtype_t		dtype_binary_val = {DATA_BINARY, 0, 0, 0, 0};
+dtype_t		dtype_binary_val = {DATA_BINARY, 0, 0, 0};
 dtype_t* 	dtype_binary 	= &dtype_binary_val;
 
 /*************************************************************************

innobase/include/data0type.h

@@ -12,6 +12,7 @@ Created 1/16/1996 Heikki Tuuri
 #include "univ.i"
 
 extern ulint	data_mysql_default_charset_coll;
+extern ulint	data_mysql_latin1_swedish_charset_coll;
 
 /* SQL data type struct */
 typedef struct dtype_struct		dtype_t;
@@ -30,8 +31,8 @@ extern dtype_t* 	dtype_binary;
 #define DATA_BINARY	4	/* binary string */
 #define DATA_BLOB	5	/* binary large object, or a TEXT type;
 				if prtype & DATA_BINARY_TYPE == 0, then this is
-				actually a TEXT column; see also below about
-				the flag DATA_NONLATIN1 */
+				actually a TEXT column (or a BLOB created
+				with < 4.0.14) */
 #define	DATA_INT	6	/* integer: can be any size 1 - 8 bytes */
 #define	DATA_SYS_CHILD	7	/* address of the child page in node pointer */
 #define	DATA_SYS	8	/* system column */
@@ -59,7 +60,7 @@ Tables created by a MySQL user have the following convention:
 code (not applicable for system columns).
 
 - In the second least significant byte we OR flags DATA_NOT_NULL,
-DATA_UNSIGNED, DATA_BINARY_TYPE, DATA_NONLATIN1.
+DATA_UNSIGNED, DATA_BINARY_TYPE.
 
 - In the third least significant byte of the precise type of string types we
 store the MySQL charset-collation code. In DATA_BLOB columns created with
@@ -73,6 +74,23 @@ installation. If the stored charset code is 0 in the system table SYS_COLUMNS
 of InnoDB, that means that the default charset of this MySQL installation
 should be used.
 
+When loading a table definition from the system tables to the InnoDB data
+dictionary cache in main memory, InnoDB versions >= 4.1.2 and >= 5.0.1 check
+if the stored charset-collation is 0, and if that is the case and the type is
+a non-binary string, replace that 0 by the default charset-collation code of
+this MySQL installation. In short, in old tables, the charset-collation code
+in the system tables on disk can be 0, but in in-memory data structures
+(dtype_t), the charset-collation code is always != 0 for non-binary string
+types.
+
+In new tables, in binary string types, the charset-collation code is the
+MySQL code for the 'binary charset', that is, != 0.
+
+For binary string types and for DATA_CHAR, DATA_VARCHAR, and for those
+DATA_BLOB which are binary or have the charset-collation latin1_swedish_ci,
+InnoDB performs all comparisons internally, without resorting to the MySQL
+comparison functions. This is to save CPU time.
+
 InnoDB's own internal system tables have different precise types for their
 columns, and for them the precise type is usually not used at all.
 */
@@ -112,14 +130,10 @@ be less than 256 */
 				string, this is ORed to the precise type:
 				this only holds for tables created with
 				>= MySQL-4.0.14 */
-#define	DATA_NONLATIN1 2048	/* If the data type is DATA_BLOB with
-				the prtype & DATA_BINARY_TYPE == 0, that is,
-				TEXT, then in versions 4.0.14 - 4.0.xx this
-				flag is set to 1, if the charset is not
-				latin1. In version 4.1.1 this was set
-				to 1 for all TEXT columns. In versions >= 4.1.2
-				this is set to 1 if the charset-collation of a
-				TEXT column is not latin1_swedish_ci. */
+/* #define	DATA_NONLATIN1	2048 This is a relic from < 4.1.2 and < 5.0.1.
+				In earlier versions this was set for some
+				BLOB columns.
+*/
 /*-------------------------------------------*/
 
 /* This many bytes we need to store the type information affecting the
@@ -210,7 +224,7 @@ ulint
 dtype_form_prtype(
 /*==============*/
 	ulint	old_prtype,	/* in: the MySQL type code and the flags
-				DATA_NONLATIN1 etc. */
+				DATA_BINARY_TYPE etc. */
 	ulint	charset_coll);	/* in: MySQL charset-collation code */
 /*************************************************************************
 Gets the type length. */

innobase/include/data0type.ic

@@ -143,7 +143,7 @@ dtype_get_charset_coll(
 /*===================*/
 	ulint	prtype)	/* in: precise data type */
 {
-	return((prtype >> 16) & 0xFF);
+	return((prtype >> 16) & 0xFFUL);
 }
 
 /*************************************************************************
@@ -153,7 +153,7 @@ ulint
 dtype_form_prtype(
 /*==============*/
 	ulint	old_prtype,	/* in: the MySQL type code and the flags
-				DATA_NONLATIN1 etc. */
+				DATA_BINARY_TYPE etc. */
 	ulint	charset_coll)	/* in: MySQL charset-collation code */
 {
 	ut_a(old_prtype < 256 * 256);
@@ -237,9 +237,10 @@ dtype_new_store_for_order_and_null_size(
 		buf[0] = buf[0] | 128;
 	}
 
-	if (type->prtype & DATA_NONLATIN1) {
-		buf[0] = buf[0] | 64;
-	}
+	/* In versions < 4.1.2 we had: 	if (type->prtype & DATA_NONLATIN1) {
+						buf[0] = buf[0] | 64;
+					}
+	*/
 
 	buf[1] = (byte)(type->prtype & 0xFFUL);
 
@@ -271,10 +272,6 @@ dtype_read_for_order_and_null_size(
 	        type->prtype = type->prtype | DATA_BINARY_TYPE;
 	}
 
-	if (buf[0] & 64) {
-	        type->prtype = type->prtype | DATA_NONLATIN1;
-	}
-
 	type->len = mach_read_from_2(buf + 2);
 		
 	type->prtype = dtype_form_prtype(type->prtype,
@@ -303,10 +300,6 @@ dtype_new_read_for_order_and_null_size(
 	        type->prtype = type->prtype | DATA_BINARY_TYPE;
 	}
 
-	if (buf[0] & 64) {
-	        type->prtype = type->prtype | DATA_NONLATIN1;
-	}
-
 	type->len = mach_read_from_2(buf + 2);
 
 	mach_read_from_2(buf + 4);

innobase/rem/rem0cmp.c

@@ -331,7 +331,9 @@ cmp_data_data_slow(
 	
 	if (cur_type->mtype >= DATA_FLOAT
 	    || (cur_type->mtype == DATA_BLOB
-	        && (cur_type->prtype & DATA_NONLATIN1))) {
+	        && 0 == (cur_type->prtype & DATA_BINARY_TYPE)
+		&& dtype_get_charset_coll(cur_type->prtype) !=
+				data_mysql_latin1_swedish_charset_coll)) {
 
 		return(cmp_whole_field(cur_type, data1, len1, data2, len2));
 	}
@@ -532,8 +534,10 @@ cmp_dtuple_rec_with_match(
 		}
 
 		if (cur_type->mtype >= DATA_FLOAT
-		    || (cur_type->mtype == DATA_BLOB
-	                && (cur_type->prtype & DATA_NONLATIN1))) {
+	    	    || (cur_type->mtype == DATA_BLOB
+	        	&& 0 == (cur_type->prtype & DATA_BINARY_TYPE)
+			&& dtype_get_charset_coll(cur_type->prtype) !=
+				data_mysql_latin1_swedish_charset_coll)) {
 
 			ret = cmp_whole_field(cur_type,
 				dfield_get_data(dtuple_field), dtuple_f_len,
@@ -854,8 +858,10 @@ cmp_rec_rec_with_match(
 		}
 
 		if (cur_type->mtype >= DATA_FLOAT
-		    || (cur_type->mtype == DATA_BLOB
-	                && (cur_type->prtype & DATA_NONLATIN1))) {
+	    	    || (cur_type->mtype == DATA_BLOB
+	        	&& 0 == (cur_type->prtype & DATA_BINARY_TYPE)
+			&& dtype_get_charset_coll(cur_type->prtype) !=
+				data_mysql_latin1_swedish_charset_coll)) {
 
 			ret = cmp_whole_field(cur_type,
 						rec1_b_ptr, rec1_f_len,

sql/ha_innodb.cc

@@ -755,11 +755,6 @@ innobase_init(void)
 	        srv_set_thread_priorities = TRUE;
 	        srv_query_thread_priority = QUERY_PRIOR;
 	}
-	
-	/* Store the default charset-collation number of this MySQL
-	installation */
-
-	data_mysql_default_charset_coll = (ulint)default_charset_info->number;
 
 	/* Set InnoDB initialization parameters according to the values
 	read from MySQL .cnf file */
@@ -875,6 +870,14 @@ innobase_init(void)
 
 	srv_print_verbose_log = mysql_embedded ? 0 : 1;
 
+		/* Store the default charset-collation number of this MySQL
+	installation */
+
+	data_mysql_default_charset_coll = (ulint)default_charset_info->number;
+
+	data_mysql_latin1_swedish_charset_coll =
+					(ulint)my_charset_latin1.number;
+
 	/* Store the latin1_swedish_ci character ordering table to InnoDB. For
 	non-latin1_swedish_ci charsets we use the MySQL comparison functions,
 	and consequently we do not need to know the ordering internally in
@@ -3260,7 +3263,6 @@ create_table_def(
   	ulint		nulls_allowed;
 	ulint		unsigned_type;
 	ulint		binary_type;
-	ulint		nonlatin1_type;
 	ulint		charset_no;
   	ulint		i;
 
@@ -3290,17 +3292,8 @@ create_table_def(
 			unsigned_type = 0;
 		}
 
-		if (col_type == DATA_BLOB
-		    && strcmp(field->charset()->name,
-						"latin1_swedish_ci") != 0) {
-			nonlatin1_type = DATA_NONLATIN1;
-		} else {
-		        nonlatin1_type = 0;
-		}
-
 		if (field->binary()) {
 			binary_type = DATA_BINARY_TYPE;
-		        nonlatin1_type = 0;
 		} else {
 			binary_type = 0;
 		}
@@ -3319,7 +3312,7 @@ create_table_def(
 					col_type, dtype_form_prtype( 
 					(ulint)field->type()
 					| nulls_allowed | unsigned_type
-					| nonlatin1_type | binary_type,
+					| binary_type,
 					+ charset_no),
 					field->pack_length(), 0);
 	}