community: Fix some issues with sparkllm use cases

[liugddx]

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• PR title: Please title your PR "package: description", where "package" is whichever of langchain, community, core, experimental, etc. is being modified. Use "docs: ..." for purely docs changes, "templates: ..." for template changes, "infra: ..." for CI changes.
  • Example: "community: add foobar LLM"
• PR message: Delete this entire template message and replace it with the following bulleted list
  • Description: Fix some issues with sparkllm use cases
  • Issue: No
  • Dependencies: No
  • Twitter handle: No
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  1. a test for the integration, preferably unit tests that do not rely on network access,
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Name	Status	Preview	Comments	Updated (UTC)
langchain	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 6, 2024 7:18am

[liugddx]

@baskaryan PTAL