Liya Fan created ARROW-6866:
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Summary: [Java] Improve the performance of calculating hash code
for struct vector
Key: ARROW-6866
URL: https://issues.apache.org/jira/browse/ARROW-6866
Project: Apache Arrow
Issue Type: Improvement
Components: Java
Reporter: Liya Fan
Assignee: Liya Fan
Improve the performance of hashCode(int) method for StructVector:
1. We can get the child vectors directly, so there is no need to get the name
from the child vector and then use the name to get the vector.
2. The child vectors cannot be null, so there is no need to check it.
The performance improvement depends on the complexity of the hash algorithm.
For computational intensive hash algorithms, the improvement can be small;
while for simple hash algorithms, the improvement can be notable.
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