Apache Calcite 1.5.0 发布动态数据管理框架

Apache Calcite 1.5.0 发布，该版本有大量 bug 修复和小部分改进，大幅提升了 Avatica，planner rules，和 RelBuilder 的性能。主要特性如下：

[CALCITE-911] Add a variant of CalciteSchema that does not cache sub-objects
[CALCITE-845] Derive SUM’s return type by a customizable policy (Maryann Xue)
[CALCITE-916] Support table function that implements ScannableTable
- Example table function that generates mazes and their solutions
[CALCITE-941] Named, optional and DEFAULT arguments to function calls; support named arguments when calling table functions and table macros
[CALCITE-910] Improve handling of ARRAY, MULTISET, STRUCT types
[CALCITE-879]COLLECT aggregate function
[CALCITE-546] Allow table, column and field called ‘*’
[CALCITE-893] Theta join in JDBC adapter
Linq4j: Implement EnumerableDefaults methods (MiNG)
[CALCITE-823] Add ALTER ... RESET statement (Sudheesh Katkam)
[CALCITE-881] Allow schema.table.column references in GROUP BY
[CALCITE-852] DDL statements
[CALCITE-851] Add original SQL string as a field in the parser
[CALCITE-819] Add RelRoot, a contract for the result of a relational expression

Avatica features and bug fixes

[CALCITE-951] Print the server-side stack in the local exception (Josh Elser)
[CALCITE-936] Make HttpServer configurable (Navis Ryu)
[CALCITE-903] Enable Avatica client to recover from missing server-side state (Josh Elser)
[CALCITE-921] Fix incorrectness when calling getString() on binary data (Josh Elser)
[CALCITE-913] Construct proper ColumnMetaData for arrays (Josh Elser)
[CALCITE-871] In JdbcMeta, register each statement using an id from a generator (Bruno Dumon)
[CALCITE-645] Implement AvaticaSqlException to pass server-side exception information to clients (Josh Elser)
[CALCITE-912] Add Avatica OpenConnectionRequest (Bruno Dumon)
[CALCITE-919] Avoid setScale on BigDecimal when scale is 0 (Josh Elser)
[CALCITE-927] Call finagle for all calls that return ResultSetResponses (Josh Elser)
[CALCITE-705] DML in Avatica, and split Execute out from Fetch request (Yeong Wei)
[CALCITE-914] Add JsonSubType for ExecuteResponse, and fix JSON docs (Josh Elser)
[CALCITE-905]getTables returns empty result in JdbcMeta (Jan Van Besien)
[CALCITE-906] Avatica JdbcMeta statement IDs are not unique
[CALCITE-866] Break out Avatica documentation and add JSON reference (Josh Elser)
[CALCITE-843]AvaticaConnection.getAutoCommit throws NullPointerException
[CALCITE-840] Protocol buffer serialization over HTTP for Avatica Server (Josh Elser)