flink vs spark zhihu

Shark和sparkSQL
但是，随着Spark的发展，其中sparkSQL作为Spark生态的一员继续发展，而不再受限于hive，只是兼容hive；而hive on
spark是一个hive的发展计划，该计划将spark作为hive的底层引擎之一，也就是说，hive将不再受限于一个引擎，可以采用map-
reduce、Tez、spark等引擎。

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　　作者：张宽
链接：https://www.zhihu.com/question/34569764/answer/59217173
来源：知乎
著作权归作者所有，转载请联系作者获得授权。


scala语言不是很容易懂，但是里面有解析SQL的方法，可以看出支持的SQL语句，至少关键词是很明确的。

protected val ALL = Keyword("ALL")
protected val AND = Keyword("AND")
protected val APPROXIMATE = Keyword("APPROXIMATE")
protected val AS = Keyword("AS")
protected val ASC = Keyword("ASC")
protected val BETWEEN = Keyword("BETWEEN")
protected val BY = Keyword("BY")
protected val CASE = Keyword("CASE")
protected val CAST = Keyword("CAST")
protected val DESC = Keyword("DESC")
protected val DISTINCT = Keyword("DISTINCT")
protected val ELSE = Keyword("ELSE")
protected val END = Keyword("END")
protected val EXCEPT = Keyword("EXCEPT")
protected val FALSE = Keyword("FALSE")
protected val FROM = Keyword("FROM")
protected val FULL = Keyword("FULL")
protected val GROUP = Keyword("GROUP")
protected val HAVING = Keywo...作者：张宽
链接：https://www.zhihu.com/question/34569764/answer/59217173
来源：知乎
著作权归作者所有，转载请联系作者获得授权。

scala语言不是很容易懂，但是里面有解析SQL的方法，可以看出支持的SQL语句，至少关键词是很明确的。

protected val ALL = Keyword("ALL")
protected val AND = Keyword("AND")
protected val APPROXIMATE = Keyword("APPROXIMATE")
protected val AS = Keyword("AS")
protected val ASC = Keyword("ASC")
protected val BETWEEN = Keyword("BETWEEN")
protected val BY = Keyword("BY")
protected val CASE = Keyword("CASE")
protected val CAST = Keyword("CAST")
protected val DESC = Keyword("DESC")
protected val DISTINCT = Keyword("DISTINCT")
protected val ELSE = Keyword("ELSE")
protected val END = Keyword("END")
protected val EXCEPT = Keyword("EXCEPT")
protected val FALSE = Keyword("FALSE")
protected val FROM = Keyword("FROM")
protected val FULL = Keyword("FULL")
protected val GROUP = Keyword("GROUP")
protected val HAVING = Keyword("HAVING")
protected val IN = Keyword("IN")
protected val INNER = Keyword("INNER")
protected val INSERT = Keyword("INSERT")
protected val INTERSECT = Keyword("INTERSECT")
protected val INTO = Keyword("INTO")
protected val IS = Keyword("IS")
protected val JOIN = Keyword("JOIN")
protected val LEFT = Keyword("LEFT")
protected val LIKE = Keyword("LIKE")
protected val LIMIT = Keyword("LIMIT")
protected val NOT = Keyword("NOT")
protected val NULL = Keyword("NULL")
protected val ON = Keyword("ON")
protected val OR = Keyword("OR")
protected val ORDER = Keyword("ORDER")
protected val SORT = Keyword("SORT")
protected val OUTER = Keyword("OUTER")
protected val OVERWRITE = Keyword("OVERWRITE")
protected val REGEXP = Keyword("REGEXP")
protected val RIGHT = Keyword("RIGHT")
protected val RLIKE = Keyword("RLIKE")
protected val SELECT = Keyword("SELECT")
protected val SEMI = Keyword("SEMI")
protected val TABLE = Keyword("TABLE")
protected val THEN = Keyword("THEN")
protected val TRUE = Keyword("TRUE")
protected val UNION = Keyword("UNION")
protected val WHEN = Keyword("WHEN")
protected val WHERE = Keyword("WHERE")
protected val WITH = Keyword("WITH")