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This PR includes support for HANA dialect in SQLDatabase, which is a wrapper class for SQLAlchemy. Currently, it is unable to set schema name when using HANA DB with Langchain. And, it does not show any message to user so that it makes hard for user to figure out why the SQL does not work as expected. Here is the reference document for HANA DB to set schema for the session. - [SET SCHEMA Statement (Session Management)](https://help.sap.com/docs/SAP_HANA_PLATFORM/4fe29514fd584807ac9f2a04f6754767/20fd550375191014b886a338afb4cd5f.html)