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Commit48c6959

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Doc: Tweak description of B-Tree duplicate tuples.
Defining duplicates as "close by" to each other was unclear. Simplifythe definition.Backpatch: 13-, where deduplication was introduced (by commit0d861bb)
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‎doc/src/sgml/btree.sgml

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@@ -635,10 +635,10 @@ options(<replaceable>relopts</replaceable> <type>local_relopts *</type>) returns
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A duplicate is a leaf page tuple (a tuple that points to a table
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row) where <emphasis>all</emphasis> indexed key columns have values
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that match corresponding column values from at least one other leaf
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page tuplethat's close byin the same index. Duplicate tuples are
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quite common inpractice. B-Tree indexes can use a special,
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space-efficientrepresentation for duplicates when an optional
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technique isenabled: <firstterm>deduplication</firstterm>.
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page tuple in the same index. Duplicate tuples are quite common in
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practice. B-Tree indexes can use a special, space-efficient
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representation for duplicates when an optional technique is
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enabled: <firstterm>deduplication</firstterm>.
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</para>
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<para>
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Deduplication works by periodically merging groups of duplicate

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