pan3793 opened a new pull request, #52819:
URL: https://github.com/apache/spark/pull/52819
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### What changes were proposed in this pull request?
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Implement `getSchemas` methods defined in `java.sql.DatabaseMetaData` for
`SparkConnectDatabaseMetaData`.
```java
/**
* Retrieves the schema names available in this database. The results
* are ordered by {@code TABLE_CATALOG} and
* {@code TABLE_SCHEM}.
*
* <P>The schema columns are:
* <OL>
* <LI><B>TABLE_SCHEM</B> String {@code =>} schema name
* <LI><B>TABLE_CATALOG</B> String {@code =>} catalog name (may be
{@code null})
* </OL>
*
* @return a {@code ResultSet} object in which each row is a
* schema description
* @throws SQLException if a database access error occurs
*
*/
ResultSet getSchemas() throws SQLException;
/**
* Retrieves the schema names available in this database. The results
* are ordered by {@code TABLE_CATALOG} and
* {@code TABLE_SCHEM}.
*
* <P>The schema columns are:
* <OL>
* <LI><B>TABLE_SCHEM</B> String {@code =>} schema name
* <LI><B>TABLE_CATALOG</B> String {@code =>} catalog name (may be
{@code null})
* </OL>
*
*
* @param catalog a catalog name; must match the catalog name as it is
stored
* in the database;"" retrieves those without a catalog; null means
catalog
* name should not be used to narrow down the search.
* @param schemaPattern a schema name; must match the schema name as it
is
* stored in the database; null means
* schema name should not be used to narrow down the search.
* @return a {@code ResultSet} object in which each row is a
* schema description
* @throws SQLException if a database access error occurs
* @see #getSearchStringEscape
* @since 1.6
*/
ResultSet getSchemas(String catalog, String schemaPattern) throws
SQLException;
```
### Why are the changes needed?
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Enhance API coverage of the Connect JDBC driver, for example,
get[Catalogs|Schemas|Tables|...] APIs are used by SQL GUI tools such as DBeaver
for displaying the tree category.
### Does this PR introduce _any_ user-facing change?
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No, Connect JDBC driver is a new feature under development.
### How was this patch tested?
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New UT is added, also tested via DBeaver - the catalog/schema tree works now.
<img width="1260" height="892" alt="Xnip2025-11-01_01-33-38"
src="https://github.com/user-attachments/assets/ca678627-e07c-430a-9750-e7ea1d69aecf";
/>
### Was this patch authored or co-authored using generative AI tooling?
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No.
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