Description

Improves identifier handling (schema, table) to align with SQL standards for better compatibility with case-sensitive and case-normalizing databases, while minimizing SPI-breaking changes.

Motivation and Context

RFC details - prestodb/rfcs#36

• This PR focuses on generalizing schema and table name handling to better align with SQL standards. As per the current API behavior, identifiers are lowercased by default unless explicitly handled (RFC reference).

• Column name support and related changes will be addressed in a follow-up PR. Currently, column names are lowercased at the SPI level (ColumnMetadata.java#L45). Removing this generic lowercase conversion will require updates to normalize column names via the metadata API in each connector.

Impact

Improves identifier handling (schema, table) to align with SQL standards for better compatibility with case-sensitive and case-normalizing databases, while minimizing SPI-breaking changes.

Here is how Analysis Time on local Mac with 8GB JVM for EXPLAIN TPCH Queries, tpch-sf100 with (master) and with the PR changes -

Test Plan

• Existing UT passing
• Added support for Mysql and new UT added for Mysql for when mixed-case support is enabled

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• Please make sure your submission complies with our contributing guide, in particular code style and commit standards.
• PR description addresses the issue accurately and concisely. If the change is non-trivial, a GitHub Issue is referenced.
• Documented new properties (with its default value), SQL syntax, functions, or other functionality.
• If release notes are required, they follow the release notes guidelines.
• Adequate tests were added if applicable.
• CI passed.

Release Notes

Please follow release notes guidelines and fill in the release notes below.

== RELEASE NOTES ==

General Changes
* Add mixed case support for schema and table names.

JDBC Driver Changes
* Add mixed case support related catalog property in JDBC connector ``case-sensitive-name-matching``.

MySQL Connector Changes
* Add support for mixed-case in MySQL. It can be enabled by setting ``case-sensitive-name-matching=true`` configuration in the catalog configuration