[t:2494], merge handlerton portion to main

git-svn-id: file:///svn/mysql/tokudb-engine/tokudb-engine@19074 c7de825b-a66e-492c-adef-691d508d4ae1

storage/tokudb/ha_tokudb.cc

@@ -579,6 +579,9 @@ inline HA_TOKU_ISO_LEVEL tx_to_toku_iso(ulong tx_isolation) {
     if (tx_isolation == ISO_READ_UNCOMMITTED) {
         return hatoku_iso_read_uncommitted;
     }
+    else if (tx_isolation == ISO_READ_COMMITTED) {
+        return hatoku_iso_read_committed;
+    }
     else {
         return hatoku_iso_serializable;
     }
@@ -588,6 +591,9 @@ inline u_int32_t toku_iso_to_txn_flag (HA_TOKU_ISO_LEVEL lvl) {
     if (lvl == hatoku_iso_read_uncommitted) {
         return DB_READ_UNCOMMITTED;
     }
+    else if (lvl == hatoku_iso_read_committed) {
+        return DB_READ_COMMITTED;
+    }
     else {
         return 0;
     }

storage/tokudb/hatoku_defines.h

@@ -79,6 +79,7 @@ inline unsigned int my_tid() {
 typedef enum {
     hatoku_iso_not_set = 0,
     hatoku_iso_read_uncommitted,
+    hatoku_iso_read_committed,
     hatoku_iso_serializable
 } HA_TOKU_ISO_LEVEL;