DSS-5579: Fixes bug with search input: first search operation is succ… #286
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…essful but subsequent search attempts fail on enter
TonyOuyangGit
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…datahub-project#286) This PR implements flattening the `map` attribute type when scanning table items for DynamoDB ingestion. The majority of expanding nested field code logic is adopted from `metadata-ingestion/src/datahub/ingestion/source/schema_inference/object.py`, where it recursively calls `append_schema` for `map` data type field and constructs the field path delimited by `FIELD_DELIMITER`. According to data types supported in DynamoDB in aws [docs](https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/HowItWorks.NamingRulesDataTypes.html#HowItWorks.DataTypes), `List` and `Map` type both support recursive structure and since it would add more complexity for expanding list or list of maps, for now we'll only expand `Map` type and will handle expanding list in the future. This PR also adopts a [fix](datahub-project#9612) in MongoDB to sort by `count` and `delimiter_name` when downsampling the table schema Updated `test_dynamodb.py` to add `List` and `Map` type items into test table and `Map` type nested fields are ingested correctly --------- Co-authored-by: Tamas Nemeth <treff7es@gmail.com>
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…essful but subsequent search attempts fail on enter