arina-ielchiieva opened a new pull request #1615: DRILL-6964: Implement CREATE / DROP TABLE SCHEMA commands URL: https://github.com/apache/drill/pull/1615 Note: this PR only adds support for CREATE / DROP TABLE SCHEMA commands which allow to store and delete table schema. Table schema usage during querying the data will be covered in other PRs. 1. Added parser methods / handles to parse CREATE / DROP TABLE schema commands. 2. Added TableSchemaProviders classes to separate ways of schema provision (file, table function). 3. Added table schema parsing using ANTLR4 (lexer, parser, visitors). 4. Added appropriate unit tests. Details in [DRILL-6964](https://issues.apache.org/jira/browse/DRILL-6964).
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