Github user cxzl25 commented on the issue:
https://github.com/apache/spark/pull/21596
https://github.com/apache/spark/pull/20738
Bump jackson from 2.6.7&2.6.7.1 to 2.7.7
Jackson(>=2.7.7) fixes the possibility of missing tail data when the length
of the value is in a range
[https://github.com/FasterXML/jackson/wiki/Jackson-Release-2.7.7](https://github.com/FasterXML/jackson/wiki/Jackson-Release-2.7.7)
[https://github.com/FasterXML/jackson-core/issues/30](https://github.com/FasterXML/jackson-core/issues/307)
spark-shell:
```
val value = "x" * 3000
val json = s"""{"big": "$value"}"""
spark.sql("select length(get_json_object(\'"+json+"\','$.big'))" ).collect
res0: Array[org.apache.spark.sql.Row] = Array([2991])
```
expect result : 3000
actual result : 2991
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