buffer.c: added memory release for hint of a GWBUF
hint.c: added bool hint_exists()
hint.h: added placeholder for hint type HINT_ROUTE_TO_ALL which doesn't have implementation yet.
filter/Makefile: fixed dependency issue
hintparser.c: added const char* token_get_keyword(), hint_parser:added NULL check, hint_next_token: fixed off-by-one bug
readwritesplit.h: added bitfield for hints' use, which includes route targets and flag for case where user hinted to route to named backend server.
readwritesplit.c: added function route_target_t get_route_target() for resolving route target based on 1) query type (from query_classifier) 2) transaction state (active/not) and 3) hints. Modified get_dcb, which is called in routeQuery to provide pointer to correct backend DCB. Now get_dcb also takes server unique name as a parameter if such a hint was found. for hints' use, which includes enter the commit message for your changes.
Conflicts:
server/core/session.c
server/modules/protocol/mysql_backend.c
server/modules/routing/readwritesplit/readwritesplit.c
Resolved.
Addition of user in topfilter report and general tidyup
The regexfilter is an example of a query rewriting filter that uses
regular expressions to match the SQL text and allows a replacement text
to be used for each match of the regular expression.
Regexfilter has no special SQL undertanding, it merely uses the features
avialable inthe regex library to perform matches.
Statements that span multiple packets are not supported by the regex
filter.
command to call the diagnostic entries points of the filters in the
session.
Slight improvements to the two example filters and a fix to the
trim routine.
Only downstream filters are supported currently, i.e. no result
set filtering can be done.
A crude QLA (Query Log All) filter is included as a test harness only
