Fix ut_ad(!leaf) failure in rec_get_offsets_func() with spatial index

This fixes a regression that only affects debug builds, caused by
commit 48192f96 which is necessary
preparation for MDEV-11369 instant ADD COLUMN. (Although that is a
10.3 task, to ease merges between 10.2 and 10.3, this change that
improves debug checks was pushed to 10.2 already.)

Unlike btr_pcur_restore_position(), rtr_cur_restore_position()
can create a search tuple out of a non-leaf page record. So,
we must pass 'bool leaf' parameter to dict_index_build_data_tuple().

dict_index_build_data_tuple(): Add a debug-only parameter 'bool leaf'.

rec_copy_prefix_to_dtuple(): Make the parameter debug-only.

row_sel_get_clust_rec_for_mysql(): In the debug code for spatial index,
remove an unnecessary call to buf_page_get_gen(), and use the already
latched block directly.

storage/innobase/btr/btr0pcur.cc

@@ -331,7 +331,7 @@ btr_pcur_restore_position_func(
 
 	heap = mem_heap_create(256);
 
-	tuple = dict_index_build_data_tuple(index, cursor->old_rec,
+	tuple = dict_index_build_data_tuple(cursor->old_rec, index, true,
 					    cursor->old_n_fields, heap);
 
 	/* Save the old search mode of the cursor */

storage/innobase/dict/dict0dict.cc

@@ -5702,16 +5702,22 @@ dict_index_copy_rec_order_prefix(
 	return(rec_copy_prefix_to_buf(rec, index, n, buf, buf_size));
 }
 
-/**********************************************************************//**
-Builds a typed data tuple out of a physical record.
+/** Convert a physical record into a search tuple.
+@param[in]	rec		index record (not necessarily in an index page)
+@param[in]	index		index
+@param[in]	leaf		whether rec is in a leaf page
+@param[in]	n_fields	number of data fields
+@param[in,out]	heap		memory heap for allocation
 @return own: data tuple */
 dtuple_t*
-dict_index_build_data_tuple(
-/*========================*/
-	dict_index_t*	index,	/*!< in: index tree */
-	rec_t*		rec,	/*!< in: record for which to build data tuple */
-	ulint		n_fields,/*!< in: number of data fields */
-	mem_heap_t*	heap)	/*!< in: memory heap where tuple created */
+dict_index_build_data_tuple_func(
+	const rec_t*		rec,
+	const dict_index_t*	index,
+#ifdef UNIV_DEBUG
+	bool			leaf,
+#endif /* UNIV_DEBUG */
+	ulint			n_fields,
+	mem_heap_t*		heap)
 {
 	dtuple_t*	tuple;
 
@@ -5722,7 +5728,7 @@ dict_index_build_data_tuple(
 
 	dict_index_copy_types(tuple, index, n_fields);
 
-	rec_copy_prefix_to_dtuple(tuple, rec, index, true, n_fields, heap);
+	rec_copy_prefix_to_dtuple(tuple, rec, index, leaf, n_fields, heap);
 
 	ut_ad(dtuple_check_typed(tuple));
 

storage/innobase/gis/gis0sea.cc

@@ -1352,7 +1352,7 @@ rtr_cur_restore_position(
 
 	heap = mem_heap_create(256);
 
-	tuple = dict_index_build_data_tuple(index, r_cursor->old_rec,
+	tuple = dict_index_build_data_tuple(r_cursor->old_rec, index, !level,
 					    r_cursor->old_n_fields, heap);
 
 	page_cursor = btr_pcur_get_page_cur(r_cursor);

storage/innobase/include/dict0dict.h

@@ -1460,17 +1460,31 @@ dict_index_copy_rec_order_prefix(
 					copied prefix, or NULL */
 	ulint*			buf_size)/*!< in/out: buffer size */
 	MY_ATTRIBUTE((nonnull, warn_unused_result));
-/**********************************************************************//**
-Builds a typed data tuple out of a physical record.
+/** Convert a physical record into a search tuple.
+@param[in]	rec		index record (not necessarily in an index page)
+@param[in]	index		index
+@param[in]	leaf		whether rec is in a leaf page
+@param[in]	n_fields	number of data fields
+@param[in,out]	heap		memory heap for allocation
 @return own: data tuple */
 dtuple_t*
-dict_index_build_data_tuple(
-/*========================*/
-	dict_index_t*	index,	/*!< in: index */
-	rec_t*		rec,	/*!< in: record for which to build data tuple */
-	ulint		n_fields,/*!< in: number of data fields */
-	mem_heap_t*	heap)	/*!< in: memory heap where tuple created */
+dict_index_build_data_tuple_func(
+	const rec_t*		rec,
+	const dict_index_t*	index,
+#ifdef UNIV_DEBUG
+	bool			leaf,
+#endif /* UNIV_DEBUG */
+	ulint			n_fields,
+	mem_heap_t*		heap)
 	MY_ATTRIBUTE((nonnull, warn_unused_result));
+#ifdef UNIV_DEBUG
+# define dict_index_build_data_tuple(rec, index, leaf, n_fields, heap)	\
+	dict_index_build_data_tuple_func(rec, index, leaf, n_fields, heap)
+#else /* UNIV_DEBUG */
+# define dict_index_build_data_tuple(rec, index, leaf, n_fields, heap)	\
+	dict_index_build_data_tuple_func(rec, index, n_fields, heap)
+#endif /* UNIV_DEBUG */
+
 /*********************************************************************//**
 Gets the space id of the root of the index tree.
 @return space id */

storage/innobase/include/rem0rec.h

@@ -944,14 +944,23 @@ The fields are copied into the memory heap.
 @param[in]	n_fields	number of fields to copy
 @param[in,out]	heap		memory heap */
 void
-rec_copy_prefix_to_dtuple(
+rec_copy_prefix_to_dtuple_func(
 	dtuple_t*		tuple,
 	const rec_t*		rec,
 	const dict_index_t*	index,
+#ifdef UNIV_DEBUG
 	bool			is_leaf,
+#endif /* UNIV_DEBUG */
 	ulint			n_fields,
 	mem_heap_t*		heap)
 	MY_ATTRIBUTE((nonnull));
+#ifdef UNIV_DEBUG
+# define rec_copy_prefix_to_dtuple(tuple,rec,index,leaf,n_fields,heap)	\
+	rec_copy_prefix_to_dtuple_func(tuple,rec,index,leaf,n_fields,heap)
+#else /* UNIV_DEBUG */
+# define rec_copy_prefix_to_dtuple(tuple,rec,index,leaf,n_fields,heap)	\
+	rec_copy_prefix_to_dtuple_func(tuple,rec,index,n_fields,heap)
+#endif /* UNIV_DEBUG */
 /***************************************************************//**
 Validates the consistency of a physical record.
 @return TRUE if ok */

storage/innobase/rem/rem0rec.cc

@@ -1556,11 +1556,13 @@ The fields are copied into the memory heap.
 @param[in]	n_fields	number of fields to copy
 @param[in,out]	heap		memory heap */
 void
-rec_copy_prefix_to_dtuple(
+rec_copy_prefix_to_dtuple_func(
 	dtuple_t*		tuple,
 	const rec_t*		rec,
 	const dict_index_t*	index,
+#ifdef UNIV_DEBUG
 	bool			is_leaf,
+#endif /* UNIV_DEBUG */
 	ulint			n_fields,
 	mem_heap_t*		heap)
 {

storage/innobase/row/row0sel.cc

@@ -3393,23 +3393,12 @@ row_sel_get_clust_rec_for_mysql(
                                 goto func_exit;
 			}
 
-			ulint		page_no = page_get_page_no(
-						btr_pcur_get_page(
-							prebuilt->pcur));
-
-			page_id_t	page_id(dict_index_get_space(sec_index),
-						page_no);
-
-			buf_block_t*	block = buf_page_get_gen(
-				page_id,
-				dict_table_page_size(sec_index->table),
-				RW_NO_LATCH, NULL, BUF_GET,
-				__FILE__, __LINE__, mtr, &err);
-
+			buf_block_t* block = btr_pcur_get_block(
+				prebuilt->pcur);
 			mem_heap_t*	heap = mem_heap_create(256);
 			dtuple_t*       tuple = dict_index_build_data_tuple(
-				sec_index, const_cast<rec_t*>(rec),
-				dict_index_get_n_fields(sec_index), heap);;
+				rec, sec_index, true,
+				sec_index->n_fields, heap);
 			page_cur_t     page_cursor;
 
 		        ulint		low_match = page_cur_search(