fix metadata parsing exception in document_store.py#134
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Fix server crash when passing metadata to running DocumentStoreServer pathway.engine.EngineError: Parse error: Invalid character: \ (line 0, column 11) (category==\'food\')
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Hey @salvogs, thanks for this pull request - after looking at this issue I agree that this needs to be fixed. I think, however, that you should completely remove the whole line. More importantly, currently our tests are incorrect and would fail after your change (in |
biplavbarua
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Jan 15, 2026
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LGTM. usage of backticks in metadata keys/values is a common trap for JmesPath.
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Bug Report: JMESPath Filter Parse Error with Escaped Single Quotes
Problem Description
The _get_jmespath_filter function in [document_store.py] causes a parsing error when processing metadata filters that contain single quotes. The function incorrectly escapes single quotes by adding backslashes, which creates invalid JMESPath syntax.
Error Message:
pathway.engine.EngineError: Parse error: Invalid character: \ (line 0, column 11)
(category=='food')
Root Cause:
In line 38 of [document_store.py], the function performs this transformation:
When a metadata filter like category=='food' is processed, it becomes category=='food', which contains escaped single quotes that are invalid in JMESPath syntax.