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https://docs.cloudera.com/documentation/enterprise/6/6.3/topics/impala_langref.html
Impala SQL Language Reference | 6.3.x | Cloudera Documentation
Impala uses SQL as its query language. To protect user investment in skills development and query design, Impala provides a high degree of compatibility with the Hive Query Language (HiveQL): Because Impala uses the same metadata store as Hive to record in
docs.cloudera.com
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