[AD-1031] Document known issues and future enhancements. (#488)

Author: Bruce Irschick

src/markdown/support/known-issues.md

@@ -0,0 +1,13 @@
+# Known Issues and Planned Future Enhancements
+
+- LIMITATION: Schema scan method 'RANDOM' is not supported on DocumentDB Elastic Cluster
+  - Please choose another scan method when connecting to a DocumentDB Elastic Cluster
+- BUG: The use of `CASE WHEN` for non-numeric types may throw an exception.
+- BUG: ResultMetaData reports `VARCHAR` on a column that would normally report `NULL`.
+- BUG: Some JavaDocs are incomplete for some interfaces.
+- BUG: Using a literal comparison that resolves to `FALSE` throws exception (e.g., `WHERE 3 > 4`)
+- BUG: Method `Driver.getParentLogger` is not implemented.
+- ENHANCEMENT: URL-encode user-name and password in Tableau Connector
+- ENHANCEMENT: Methods `DatabaseMetaData.getIndexInfo` and `DatabaseMetaData.getBestRowIdentifier` are not implemented.
+- ENHANCEMENT: Implement a fully functional PreparedStatement with replaceable query parameters.
+- ENHANCEMENT: Implement SQL hints for supporting 'allowDiskUse' on a query-by-query basis.