When we compress a chunk, we create a new compressed chunk for storing
the compressed data. So far, the tuples were just inserted into the
compressed chunk and frozen by a later vacuum run.
However, freezing tuples causes WAL activity can be optimized because
the compressed chunk is created in the same transaction as the tuples.
This patch reduces the WAL activity by storing these tuples directly as
frozen and preventing a freeze operation in the future. This approach is
similar to PostgreSQL's COPY FREEZE.
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