最新版本:https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-Keywords,Non-reservedKeywordsandReservedKeywords
最新版本:https://ci.apache.org/projects/flink/flink-docs-stable/dev/table/sql/
11版本:https://www.postgresql.org/docs/8.1/sql-keywords-appendix.html
最新版本:https://spark.apache.org/docs/latest/sql-ref-ansi-compliance.html
各种版本:https://docs.cloudera.com/cdp-private-cloud-base/7.1.6/impala-sql-reference/topics/impala-reserved-words.html
mysql-5.7:https://dev.mysql.com/doc/refman/5.7/en/keywords.html#keywords-in-current-series