DOC: [TD- ] Updates for Java Connector markdown files [TD- ] Changed the description of quotation marks in password change [TD- ] Fix timestamp precision description. [TD- ] Improve building steps with specific linux distributions [TD- ] Improve the readme document with building steps [TD- ] Modify wallevel description in section 2 of Master/Slave vnode writing process [TD- ] Update TAOS SQL-ch.md [TD- ] Update faq-ch.md [TD- ] Fix some typo and expired content in documents. [TD- ] Add entrance for Lua connector introduction. FIX BUGS: [TD-804] refresh meta data if SQL cannot be parsed [TD-225] fix last query bug and add some function definitions. Add test cases, Fix compiler error. [TD-934] fix invalid SQL [TD-1248 TD-1044 TD-1247] fix crash in tcache.c [TD-1227] add test case [TD-1302] Interval query ignores the loading of data block, resulting in crash [TD-1278] fix bug: If the tag is too long, no error will be reported [TD-1250] Support the join of nchar [TD-1099] natual interval in stream and bug fix, natual month/year processing [TD-621] Looking for the hidden trouble of memory allocation failure in query process [TD-1173] Invalid account permission setting [TD-1247] crash while release hash obj [TD-1230] last_ Row supports time range filtering [TD-1257] Starting a non master node first may cause the cluster to be out of sync [TD-1090] compile error in windows [TD- ] Fixed a problem with crash_gen tool, so that it releases DB connections properly [TD- ] Update query api for Lua connector. [TD- ] All connectors should be updated since taos_query has been modified for thread safety. Only query api is updated, callback in stream is not yet. [TD- ] Fixed a major problem in crash_gen tool, now it properly releases DB connections [TD- ] daemon works with strict mode now. [TD- ] add docker repo link [TD- ] fix var/log/taos permission issue. [TD- ] add historyfile plug to access .taos_history file. [TD- ] Update query api for Lua connector. [TD- ] add more check on data compress and decompress [TD- ] updates for Java Connector NEW FEATURES: [TD-1256] Add description in faq for integrating network connectivity test into Taos program ENHANCEMENTS: [TD-1206] Optimizing the query performance of percentile with a new temporary file storage structure [TD-1204] Improve the performance of restful interface [TD- ] add natural interval support, now if query with: select count(*) from meters interval(1n); the actual interval is natural month instead of 30 days. here n is for natural month, and y is for natural year. [TD- ] last_row function supports time range filtering，and this time filter works as expected.