[t:4544], create variable tokudb_log_client_errors to control whether client errors get logged

git-svn-id: file:///svn/mysql/tokudb-engine/tokudb-engine@41218 c7de825b-a66e-492c-adef-691d508d4ae1

storage/tokudb/ha_tokudb.cc

@@ -7761,7 +7761,9 @@ void ha_tokudb::print_error(int error, myf errflag) {
 #if MYSQL_VERSION_ID < 50500
     if ((tokudb_debug & TOKUDB_DEBUG_HIDE_DDL_LOCK_ERRORS) == 0) {
         THD* thd = ha_thd();
-        sql_print_error("query \"%s\" returned handler error %d", thd->query_string.str, error);
+        if (get_log_client_errors(thd)) {
+            sql_print_error("query \"%s\" returned handler error %d", thd->query_string.str, error);
+        }
     }
 #endif
     handler::print_error(error, errflag);

storage/tokudb/hatoku_hton.cc

@@ -107,6 +107,13 @@ static MYSQL_THDVAR_BOOL(prelock_empty,
   NULL, 
   TRUE
   );
+static MYSQL_THDVAR_BOOL(log_client_errors,
+  0,
+  "Tokudb Log Client Errors",
+  NULL, 
+  NULL, 
+  FALSE
+  );
 static MYSQL_THDVAR_UINT(block_size,
   0,
   "fractal tree block size",
@@ -666,6 +673,10 @@ bool get_prelock_empty(THD* thd) {
     return (THDVAR(thd, prelock_empty) != 0);
 }
 
+bool get_log_client_errors(THD* thd) {
+    return (THDVAR(thd, log_client_errors) != 0);
+}
+
 uint get_tokudb_block_size(THD* thd) {
     return THDVAR(thd, block_size);
 }
@@ -1458,6 +1469,7 @@ static struct st_mysql_sys_var *tokudb_system_variables[] = {
     MYSQL_SYSVAR(init_flags),
     MYSQL_SYSVAR(checkpointing_period),
     MYSQL_SYSVAR(prelock_empty),
+    MYSQL_SYSVAR(log_client_errors),
     MYSQL_SYSVAR(checkpoint_lock),
     MYSQL_SYSVAR(write_status_frequency),
     MYSQL_SYSVAR(read_status_frequency),

storage/tokudb/hatoku_hton.h

@@ -16,6 +16,7 @@ bool get_disable_slow_alter(THD* thd);
 bool get_create_index_online(THD* thd);
 bool get_disable_prefetching(THD* thd);
 bool get_prelock_empty(THD* thd);
+bool get_log_client_errors(THD* thd);
 uint get_tokudb_block_size(THD* thd);
 uint get_tokudb_read_block_size(THD* thd);
 uint get_tokudb_read_buf_size(THD* thd);