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liyafan82 authored and Micah Kornfield committed e8ab3ae5ccd
ARROW-13733 [Java]: Allow JDBC adapters to reuse vector schema roots According to the current design of the JDBC adapter, it is not possible to reuse the vector schema roots. That is, a new vector schema root is created and released for each batch. This can cause performance problems, because in many scenarios, the client code only reads data in vector schema root. So the vector schema roots can be reused in the following cycle: populate data -> client use data -> populate data -> ... The current design has another problem. For most times, it has two alternating vector schema roots in memory, causing a large waste of memory, especially for large batches. We solve both problems by providing a flag in the config, which allows the user to reuse the vector shema roots. Closes #10983 from liyafan82/fly_0824_jd Authored-by: liyafan82 <fan_li_ya@foxmail.com> Signed-off-by: Micah Kornfield <emkornfield@gmail.com>