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717d0e8dd9
fc069a3a63 implements Self-Join Elimination (SJE) and provides a new GUC
variable: enable_self_join_elimination. This new GUC variable was marked
as GUC_NOT_IN_SAMPLE. However, enable_self_join_elimination is documented
and is not different from any other enable_* GUCs. Thus, remove
GUC_NOT_IN_SAMPLE from it and add it to the postgresql.conf.sample.
Discussion: https://postgr.es/m/CAPpHfdsqMTEsmxk3aQwt6xPz%2BKpUELO%3D6fzmER9ZRGrbs4uMfA%40mail.gmail.com
Author: Tender Wang <tndrwang@gmail.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>