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The Delta Decimal type wasn't handled correctly in the Druid Delta connector, resulting in the error: Unsupported fieldType[Decimal(4, 2)] for fieldName[price]. There were no tests or existing tables with the Decimal type, so I've updated the existing table, complex-types-table to include this data type. Note that the Decimal type can only be handled as a double at most in Druid. For a big decimal that cannot fit inside a double, it should be ingested as a string.