Apache Calcite 1.7.0 发布，动态数据管理框架

Apache Calcite 1.7.0 发布了。Apache Calcite 是一个动态数据管理框架，用于 Hadoop 平台。

新特性：

[CALCITE-1124] Add TIMESTAMPADD, TIMESTAMPDIFF functions (Arina Ielchiieva)
[CALCITE-1066] Add Oracle function table, and functions DECODE, NVL, LTRIM, RTRIM,GREATEST, LEAST
[CALCITE-1080] Cassandra adapter (Michael Mior)
[CALCITE-1062] In validation, lookup a (possibly overloaded) operator from an operator table (Hsuan-Yi Chu)
[CALCITE-551] Sub-query inside aggregate function

bug修复：

[CALCITE-1147] Allow multiple providers for the same kind of metadata
[CALCITE-1153] Invalid cast created during SQL Join in Oracle (Chris Atkinson)
[CALCITE-1146] Wrong path in CSV example model (wanglan)
[CALCITE-1156] Increase Jetty version to 9.2.15.v20160210
[CALCITE-1064] Address problematic maven-remote-resources-plugin
In TimeUnit add WEEK, QUARTER, MICROSECOND values, and change type ofmultiplier
Deprecate SqlLiteral.SqlSymbol; SqlSymbol can now wrap any enum
[CALCITE-1078] Detach avatica from the core calcite Maven project

[CALCITE-1111] Upgrade Guava, and test on a range of Guava versions
[CALCITE-1054] Wrong code generation for TIMESTAMP values that may be NULL
[CALCITE-604] Tune metadata by generating a dispatcher at runtime
[CALCITE-1063] Flat lists for 4, 5, 6 elements
Add Orinoco schema (streaming retail data), accessible from Quidem scripts
[CALCITE-1097] Exception when executing query with too many aggregation columns (chenzhifa)

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