fix rdbms_db_summary

[yyhhyyyyyy]

Description

Fix the issue where the program cannot start when using a PostgreSQL database.

2024-04-11 23:55:09 PC-20240108PCVE dbgpt.rag.summary.db_summary_client[6704] WARNING django, postgresql summary error!tuple indices must be integers or slices, not str, detail: Traceback (most recent call last):
  File "\dbgpt\rag\summary\db_summary_client.py", line 74, in init_db_summary
    self.db_summary_embedding(item["db_name"], item["db_type"])
  File "\dbgpt\rag\summary\db_summary_client.py", line 42, in db_summary_embedding
    db_summary_client = RdbmsSummary(dbname, db_type)
  File "\dbgpt\rag\summary\rdbms_db_summary.py", line 48, in __init__
    self.table_info_summaries = [
  File "\dbgpt\rag\summary\rdbms_db_summary.py", line 49, in <listcomp>
    self.get_table_summary(table_name) for table_name in tables
  File "\dbgpt\rag\summary\rdbms_db_summary.py", line 59, in get_table_summary
    return _parse_table_summary(self.db, self.summary_template, table_name)
  File "\dbgpt\rag\summary\rdbms_db_summary.py", line 107, in _parse_table_summary
    key_str = ", ".join(index_key["column_names"])
TypeError: tuple indices must be integers or slices, not str

How Has This Been Tested?

python examples/sdk/chat_data_with_awel.py but please use a PostgreSQL database connection like this:

db_conn = PostgreSQLConnector.from_uri_db(
    host="localhost",
    port=5432,
    user="postgres",
    password="123",
    db_name="db"
)

Snapshots:

Please test directly.

Checklist:

• My code follows the style guidelines of this project
• I have already rebased the commits and make the commit message conform to the project standard.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• Any dependent changes have been merged and published in downstream modules

[fangyinc]

Hi, @yyhhyyyyyy, thank you for your contribution, but the current unit test does not pass, please fix it.

[yyhhyyyyyy]

@fangyinc , I have already fixed this issue. Please test it.

[fangyinc]

LGTM.

[csunny]

r+