[HUDI-4894] Fix ClassCastException when using fixed type defining dec…

[wangxianghu]

when use fixed type to define decimal column, hudi will throw a ClassCastException

Caused by: java.lang.ClassCastException: java.lang.Double cannot be cast to java.util.List
at org.apache.hudi.avro.MercifulJsonConverter$9.convert(MercifulJsonConverter.java:254)
at org.apache.hudi.avro.MercifulJsonConverter$JsonToAvroFieldProcessor.convertToAvro(MercifulJsonConverter.java:151)
at org.apache.hudi.avro.MercifulJsonConverter.convertJsonToAvroField(MercifulJsonConverter.java:140)
at org.apache.hudi.avro.MercifulJsonConverter.convertJsonToAvro(MercifulJsonConverter.java:107)
at org.apache.hudi.avro.MercifulJsonConverter.convert(MercifulJsonConverter.java:96)
at org.apache.hudi.utilities.sources.helpers.AvroConvertor.fromJs

schema for decimal column

{
    "name": "column_name",
    "type": ["null", {
        "type": "fixed",
        "name": "fixed",
        "size": 5,
        "logicalType": "decimal",
        "precision": 10,
        "scale": 2
    }],
    "default": null
}

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• [ ] Read through contributor's guide
• [ ] Change Logs and Impact were stated clearly
• [ ] Adequate tests were added if applicable
• [ ] CI passed

[wangxianghu]

@hudi-bot run azure

[nsivabalan]

cancelling all azure CI runs for now to investigate CI flakiness. will retrigger build once we are in stable state. sorry about the inconvenience.

[wangxianghu]

@shenh062326 can you also take a look at this ?

[hudi-bot]

CI report:

• a41207c6914f7e5778658abc361f4c8cb50be13a Azure: FAILURE

Bot commands

@hudi-bot supports the following commands:

• @hudi-bot run azure re-run the last Azure build

[nsivabalan]

@xushiyan : PR is assigned to you. Will you be following up?