tree e4914a646fad4d12b9022fd350d3b9be9badfbab
parent 96eb043131c3aa24d3e7de6be11fde0d7c776109
author Robert Muir <rmuir@apache.org> 1614552870 -0500
committer Robert Muir <rmuir@apache.org> 1614552870 -0500
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LUCENE-9816: lazy-init LZ4-HC hashtable in BlockTreeTermsWriter

LZ4-HC hashtable is heavy (128kb int[] + 128kb short[]) and must be
filled with special values on initialization. This is a lot of overhead
for fields that might not use the compression at all.

Don't initialize this for a field until we see hints that the data might
be compressible and need to use the table in order to test it out.