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A Flexible, Fast, Federated(3F) SQL Analysis Middleware for Multiple Data Sources

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Features: 1. Convert sql to storage's query syntax 2. check sql security

enhancement

find DruidSchema.java ` * Creates a Druid schema. * * @param url URL of query REST service, e.g. "http://localhost:8082" * @param coordinatorUrl URL of coordinator REST service, * e.g. "http://localhost:8081"...

Bumps [checkstyle](https://github.com/checkstyle/checkstyle) from 8.12 to 8.29. Release notes *Sourced from [checkstyle's releases](https://github.com/checkstyle/checkstyle/releases).* > ## checkstyle-8.29 > https://checkstyle.org/releasenotes.html#Release_8.29 > > ## checkstyle-8.28 > https://checkstyle.org/releasenotes.html#Release_8.28 > > ## checkstyle-8.27 > https://checkstyle.org/releasenotes.html#Release_8.27 >...

dependencies

Bumps `hive-driver.version` from 1.2.1 to 3.1.2000.7.0.3.0-79. Updates `hive-jdbc` from 1.2.1 to 3.1.2000.7.0.3.0-79 Updates `hive-metastore` from 1.2.1 to 3.1.2000.7.0.3.0-79 Updates `hive-exec` from 1.2.1 to 3.1.2000.7.0.3.0-79 Dependabot will resolve any conflicts with...

dependencies

For the execution results of the Spark, currently it can only be collected to the Driver. Due to the memory size, only 100,000 rows of data are returned.

The version of built-in data source driver cannot adapt all user environment.

e.g. `SELECT 1` should run without any engine, at present `qsql-class` will report the error when checking.

比如在使用hive的struct类型字段(student.name)查询时,calcite会把student当做表处理,提示找不到对应的表。 使用array和map时好像也因为字段类型报错ParseException:Concrete Message is: VARCHAR

enhancement

![image](https://user-images.githubusercontent.com/6330136/68525059-93a66a00-0308-11ea-95d9-3b5b53291bc9.png) ![image](https://user-images.githubusercontent.com/6330136/68525066-a02ac280-0308-11ea-9aa0-67db3965e5e0.png) 注释System.exit(0) 之后查询无法退出

bug