Indhumathi27 opened a new pull request #3910:
URL: https://github.com/apache/carbondata/pull/3910
### Why is this PR needed?
When DataType(For eg, StringType) object is serialized and deserialized
using Gson, DataType object after deserialization, gets changed to Main class
(DataType) instance instead of child type(StringType in this example).
Because of this, presto query on table with complex columns fails with NPE,
because while filing
DimensionAndMeasureDetails(SegmentProperties.fillDimensionAndMeasureDetails)
from CarbonLocalInputSplit.getDetailInfo, list of child dimensions will be left
unfilled for Parent Carbon Dimension.
### What changes were proposed in this PR?
1. Override JsonDeserializer method for DataType and deserialize the
jsonObject based on its DataType child class instance.
2. Add registerTypeAdapter for DataType class to gsonObject, while
deserializing carbonLocalInputSplit.detailInfo.
### Does this PR introduce any user interface change?
- No
### Is any new testcase added?
- Yes
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