neoremind created CALCITE-3878:
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Summary: Make ArrayList creation with initial capacity when size
is fixed
Key: CALCITE-3878
URL: https://issues.apache.org/jira/browse/CALCITE-3878
Project: Calcite
Issue Type: Improvement
Components: core
Affects Versions: 1.22.0
Reporter: neoremind
I find many places in Calcite where _new ArrayList<>()_ is used, if the list is
expected to be immutable or not resizing, it is always a good manner to create
with initial capacity, better for memory usage and performance.
I search all occurrences, to make it safe, I only update local variables with
fixed size and not working in recursive method. If the local variable reference
goes out of scope, if resizing is needed, things will work normally as well, so
no side effect, but for the "escaping" case, I am very conservative and do not
change them.
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