{"record":{"id":"cbef21686ad7c56b","repo":"pathwaycom/pathway","slug":"no-pathway-table-schema-is-stored-in-the-given-del","errorCode":null,"errorMessage":"No Pathway table schema is stored in the given Delta table's metadata","messagePattern":"No Pathway table schema is stored in the given Delta table's metadata","errorType":"validation","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"python/pathway/io/deltalake/__init__.py","lineNumber":519,"sourceCode":"    )\n\n\ndef _read_table_schema_from_metadata(\n    uri: str, storage_options: dict[str, str] | None\n) -> type[Schema]:\n    from deltalake import DeltaTable\n\n    table = DeltaTable(uri, storage_options=storage_options)\n    schema = table.schema()\n    table_schema = {}\n    for field in schema.fields:\n        name = field.name\n        metadata = field.metadata.get(_PATHWAY_COLUMN_META_FIELD)\n        if metadata is None:\n            continue\n        table_schema[name] = json.loads(metadata)\n    if len(table_schema) == 0:\n        raise ValueError(\n            \"No Pathway table schema is stored in the given Delta table's metadata\"\n        )\n    return schema_from_dict(table_schema)\n\n\n@check_arg_types\n@trace_user_frame\ndef write(\n    table: Table,\n    uri: str | PathLike,\n    *,\n    s3_connection_settings: (\n        AwsS3Settings | MinIOSettings | WasabiS3Settings | DigitalOceanS3Settings | None\n    ) = None,\n    partition_columns: Iterable[ColumnReference] | None = None,\n    min_commit_frequency: int | None = 60_000,\n    name: str | None = None,\n    sort_by: Iterable[ColumnReference] | None = None,","sourceCodeStart":501,"sourceCodeEnd":537,"githubUrl":"https://github.com/pathwaycom/pathway/blob/fa2f74a4649b7c5908690cf60137263d8d80de5f/python/pathway/io/deltalake/__init__.py#L501-L537","documentation":"Error \"No Pathway table schema is stored in the given Delta table's metadata\" thrown in pathwaycom/pathway.","triggerScenarios":"Thrown at python/pathway/io/deltalake/__init__.py:519 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Write the Delta table with pw.io.deltalake.write first (which stores the Pathway schema in the table metadata), or provide the schema explicitly on read."],"exampleFix":"pw.io.deltalake.read(uri, schema=MySchema)","handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"fa2f74a4649b7c5908690cf60137263d8d80de5f","analyzedAt":"2026-08-15T01:48:17.006Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}