Remove dict_col_t::clust_pos.

dict_col_get_clust_pos(): Add parameter clust_index.  Replace the
look-up with a linear search of all columns in the clustered index.

row_upd_index_replace_new_col_vals(): Compute clust_index outside
the loops.  Compute clust_pos outside the inner loop.

row_upd_changes_ord_field_binary(), row_upd_changes_first_fields_binary():
Compute clust_index outside the loops.  Declare the auxiliary variables
inside the loop scope.

dict/dict0dict.c

@@ -528,7 +528,7 @@ dict_index_get_nth_col_pos(
 
 	if (index->type & DICT_CLUSTERED) {
 
-		return(dict_col_get_clust_pos(col));
+		return(dict_col_get_clust_pos(col, index));
 	}
 
 	n_fields = dict_index_get_n_fields(index);
@@ -1756,18 +1756,6 @@ dict_index_build_internal_clust(
 	ut_ad((index->type & DICT_IBUF)
 	      || (UT_LIST_GET_LEN(table->indexes) == 0));
 
-	/* Store to the column structs the position of the table columns
-	in the clustered index */
-
-	for (i = 0; i < new_index->n_def; i++) {
-		field = dict_index_get_nth_field(new_index, i);
-
-		if (field->prefix_len == 0) {
-
-			field->col->clust_pos = i;
-		}
-	}
-
 	new_index->cached = TRUE;
 
 	return(new_index);

dict/dict0mem.c

@@ -136,8 +136,6 @@ dict_mem_table_add_col(
 	col->name = mem_heap_strdup(table->heap, name);
 	col->ord_part = 0;
 
-	col->clust_pos = REC_MAX_N_FIELDS;
-
 	type = dict_col_get_type(col);
 
 	dtype_set(type, mtype, prtype, len);

handler/ha_innodb.cc

@@ -3165,7 +3165,7 @@ include_field:
 
 		if (index == clust_index) {
 			templ->rec_field_no = dict_col_get_clust_pos
-				(&index->table->cols[i]);
+				(&index->table->cols[i], index);
 		} else {
 			templ->rec_field_no = dict_index_get_nth_col_pos(
 								index, i);
@@ -3225,7 +3225,8 @@ skip_field:
 			templ = prebuilt->mysql_template + i;
 
 			templ->rec_field_no = dict_col_get_clust_pos
-				(&index->table->cols[templ->col_no]);
+				(&index->table->cols[templ->col_no],
+				 clust_index);
 		}
 	}
 }
@@ -3491,9 +3492,11 @@ calc_row_difference(
 	ulint		col_type;
 	ulint		n_changed = 0;
 	dfield_t	dfield;
+	dict_index_t*	clust_index;
 	uint		i;
 
 	n_fields = table->s->fields;
+	clust_index = dict_table_get_first_index_noninline(prebuilt->table);
 
 	/* We use upd_buff to convert changed fields */
 	buf = (byte*) upd_buff;
@@ -3599,7 +3602,7 @@ calc_row_difference(
 
 			ufield->exp = NULL;
 			ufield->field_no = dict_col_get_clust_pos
-				(&prebuilt->table->cols[i]);
+				(&prebuilt->table->cols[i], clust_index);
 			n_changed++;
 		}
 	}

include/dict0dict.h

@@ -96,7 +96,8 @@ UNIV_INLINE
 ulint
 dict_col_get_clust_pos(
 /*===================*/
-	dict_col_t*	col);
+	const dict_col_t*	col,		/* in: table column */
+	const dict_index_t*	clust_index);	/* in: clustered index */
 /********************************************************************
 If the given column name is reserved for InnoDB system columns, return
 TRUE. */

include/dict0dict.ic

@@ -43,13 +43,23 @@ UNIV_INLINE
 ulint
 dict_col_get_clust_pos(
 /*===================*/
-	dict_col_t*	col)
+	const dict_col_t*	col,		/* in: table column */
+	const dict_index_t*	clust_index)	/* in: clustered index */
 {
-	ut_ad(col);
+	ulint	i;
 
-	return(col->clust_pos == REC_MAX_N_FIELDS
-	       ? ULINT_UNDEFINED
-	       : col->clust_pos);
+	ut_ad(col);
+	ut_ad(clust_index && clust_index->type & DICT_CLUSTERED);
+
+	for (i = 0; i < clust_index->n_def; i++) {
+		const dict_field_t*	field = &clust_index->fields[i];
+
+		if (!field->prefix_len && field->col == col) {
+			return(i);
+		}
+	}
+
+	return(ULINT_UNDEFINED);
 }
 
 /************************************************************************
@@ -324,7 +334,7 @@ dict_index_get_sys_col_pos(
 
 	if (index->type & DICT_CLUSTERED) {
 
-		return(dict_col_get_clust_pos(col));
+		return(dict_col_get_clust_pos(col, index));
 	}
 
 	return(dict_index_get_nth_col_pos

include/dict0mem.h

@@ -123,8 +123,6 @@ dict_mem_foreign_create(void);
 struct dict_col_struct{
 	ulint		ind:10;	/* table column position (they are numbered
 				starting from 0) */
-	ulint		clust_pos:10;/* position of the column in the
-				clustered index */
 	ulint		ord_part:1;/* nonzero if this column appears
 				in ordering fields of an index */
 	const char*	name;	/* name */

row/row0sel.c

@@ -102,9 +102,10 @@ row_sel_sec_rec_is_for_clust_rec(
 		ifield = dict_index_get_nth_field(sec_index, i);
 		col = dict_field_get_col(ifield);
 
-		clust_field = rec_get_nth_field(clust_rec, clust_offs,
-						dict_col_get_clust_pos(col),
-						&clust_len);
+		clust_field = rec_get_nth_field
+			(clust_rec, clust_offs,
+			 dict_col_get_clust_pos(col, clust_index),
+			 &clust_len);
 		sec_field = rec_get_nth_field(sec_rec, sec_offs, i, &sec_len);
 
 		if (ifield->prefix_len > 0

row/row0upd.c

@@ -952,28 +952,32 @@ row_upd_index_replace_new_col_vals(
 				copy the new values, set this as NULL if you
 				do not want allocation */
 {
-	dict_field_t*	field;
 	upd_field_t*	upd_field;
 	dfield_t*	dfield;
 	dfield_t*	new_val;
 	ulint		j;
 	ulint		i;
 	dtype_t*	cur_type;
+	dict_index_t*	clust_index;
 
 	ut_ad(index);
 
+	clust_index = dict_table_get_first_index(index->table);
+
 	dtuple_set_info_bits(entry, update->info_bits);
 
 	for (j = 0; j < dict_index_get_n_fields(index); j++) {
 
-		field = dict_index_get_nth_field(index, j);
+		ulint		clust_pos;
+		dict_field_t*	field = dict_index_get_nth_field(index, j);
+
+		clust_pos = dict_col_get_clust_pos(field->col, clust_index);
 
 		for (i = 0; i < upd_get_n_fields(update); i++) {
 
 			upd_field = upd_get_nth_field(update, i);
 
-			if (upd_field->field_no
-			    == dict_col_get_clust_pos(field->col)) {
+			if (upd_field->field_no == clust_pos) {
 
 				dfield = dtuple_get_nth_field(entry, j);
 
@@ -1026,30 +1030,33 @@ row_upd_changes_ord_field_binary(
 				field numbers in this MUST be clustered index
 				positions! */
 {
-	upd_field_t*	upd_field;
-	dict_field_t*	ind_field;
-	dict_col_t*	col;
 	ulint		n_unique;
 	ulint		n_upd_fields;
-	ulint		col_pos;
-	ulint		col_no;
 	ulint		i, j;
+	dict_index_t*	clust_index;
 
 	ut_ad(update && index);
 
 	n_unique = dict_index_get_n_unique(index);
 	n_upd_fields = upd_get_n_fields(update);
 
+	clust_index = dict_table_get_first_index(index->table);
+
 	for (i = 0; i < n_unique; i++) {
 
-		ind_field = dict_index_get_nth_field(index, i);
-		col = dict_field_get_col(ind_field);
-		col_pos = dict_col_get_clust_pos(col);
-		col_no = dict_col_get_no(col);
+		dict_field_t*	ind_field
+			= dict_index_get_nth_field(index, i);
+		dict_col_t*	col
+			= dict_field_get_col(ind_field);
+		ulint		col_pos
+			= dict_col_get_clust_pos(col, clust_index);
+		ulint		col_no
+			= dict_col_get_no(col);
 
 		for (j = 0; j < n_upd_fields; j++) {
 
-			upd_field = upd_get_nth_field(update, j);
+			upd_field_t*	upd_field
+				= upd_get_nth_field(update, j);
 
 			/* Note that if the index field is a column prefix
 			then it may be that row does not contain an externally
@@ -1118,29 +1125,31 @@ row_upd_changes_first_fields_binary(
 	upd_t*		update,	/* in: update vector for the row */
 	ulint		n)	/* in: how many first fields to check */
 {
-	upd_field_t*	upd_field;
-	dict_field_t*	ind_field;
-	dict_col_t*	col;
 	ulint		n_upd_fields;
-	ulint		col_pos;
 	ulint		i, j;
+	dict_index_t*	clust_index;
 
-	ut_a(update && index);
-	ut_a(n <= dict_index_get_n_fields(index));
+	ut_ad(update && index);
+	ut_ad(n <= dict_index_get_n_fields(index));
 
 	n_upd_fields = upd_get_n_fields(update);
+	clust_index = dict_table_get_first_index(index->table);
 
 	for (i = 0; i < n; i++) {
 
-		ind_field = dict_index_get_nth_field(index, i);
-		col = dict_field_get_col(ind_field);
-		col_pos = dict_col_get_clust_pos(col);
+		dict_field_t*	ind_field
+			= dict_index_get_nth_field(index, i);
+		dict_col_t*	col
+			= dict_field_get_col(ind_field);
+		ulint		col_pos
+			= dict_col_get_clust_pos(col, clust_index);
 
 		ut_a(ind_field->prefix_len == 0);
 
 		for (j = 0; j < n_upd_fields; j++) {
 
-			upd_field = upd_get_nth_field(update, j);
+			upd_field_t*	upd_field
+				= upd_get_nth_field(update, j);
 
 			if (col_pos == upd_field->field_no
 			    && !dfield_datas_are_binary_equal