Remove python eval from vector sql db chain (#10937)

<!-- Thank you for contributing to LangChain!

Replace this entire comment with:
  - **Description:** a description of the change, 
  - **Issue:** the issue # it fixes (if applicable),
  - **Dependencies:** any dependencies required for this change,
- **Tag maintainer:** for a quicker response, tag the relevant
maintainer (see below),
- **Twitter handle:** we announce bigger features on Twitter. If your PR
gets announced, and you'd like a mention, we'll gladly shout you out!

Please make sure your PR is passing linting and testing before
submitting. Run `make format`, `make lint` and `make test` to check this
locally.

See contribution guidelines for more information on how to write/run
tests, lint, etc:

https://github.com/hwchase17/langchain/blob/master/.github/CONTRIBUTING.md

If you're adding a new integration, please include:
1. a test for the integration, preferably unit tests that do not rely on
network access,
2. an example notebook showing its use. It lives in `docs/extras`
directory.

If no one reviews your PR within a few days, please @-mention one of
@baskaryan, @eyurtsev, @hwchase17.
 -->

libs/experimental/langchain_experimental/sql/vector_sql.py

@@ -8,7 +8,7 @@ from langchain.chains.llm import LLMChain
 from langchain.chains.sql_database.prompt import PROMPT, SQL_PROMPTS
 from langchain.prompts.prompt import PromptTemplate
 from langchain.schema import BaseOutputParser, BasePromptTemplate
-from langchain.schema.base import Embeddings
+from langchain.schema.embeddings import Embeddings
 from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools.sql_database.prompt import QUERY_CHECKER
 from langchain.utilities.sql_database import SQLDatabase
@@ -76,23 +76,11 @@ class VectorSQLRetrieveAllOutputParser(VectorSQLOutputParser):
         return super().parse(text)
 
 
-def _try_eval(x: Any) -> Any:
-    try:
-        return eval(x)
-    except Exception:
-        return x
-
-
 def get_result_from_sqldb(
     db: SQLDatabase, cmd: str
 ) -> Union[str, List[Dict[str, Any]], Dict[str, Any]]:
     result = db._execute(cmd, fetch="all")  # type: ignore
-    if isinstance(result, list):
-        return [{k: _try_eval(v) for k, v in dict(d._asdict()).items()} for d in result]
-    else:
-        return {
-            k: _try_eval(v) for k, v in dict(result._asdict()).items()  # type: ignore
-        }
+    return result
 
 
 class VectorSQLDatabaseChain(SQLDatabaseChain):