Handle custom extractors where the last key column is a WT_ITEM.

refs #1199

1 files changed, 6 insertions, 0 deletions

diff --git a/src/schema/schema_open.c b/src/schema/schema_open.c
index 4741b33ea7d..a4794eb61c0 100644
--- a/src/schema/schema_open.c
+++ b/src/schema/schema_open.c
@@ -217,6 +217,12 @@ __open_index(WT_SESSION_IMPL *session, WT_TABLE *table, WT_INDEX *idx)
 	WT_ERR(__wt_buf_init(session, buf, 0));
 	WT_ERR(__wt_struct_truncate(session,
 	    idx->key_format, npublic_cols, buf));
+	/*
+	 * Add a trailing padding byte to the format.  This ensures that there
+	 * will be no special optimization of the last column, so the primary
+	 * key columns can be simply appended.
+	 */
+	WT_ERR(__wt_buf_catfmt(session, buf, "x"));
 	WT_ERR(__wt_strndup(
 	    session, buf->data, buf->size, &idx->idxkey_format));