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Indexes with INCLUDE columns and their support in B-tree
This patch introduces INCLUDE clause to index definition. This clause specifies a list of columns which will be included as a non-key part in the index. The INCLUDE columns exist solely to allow more queries to benefit from index-only scans. Also, such columns don't need to have appropriate operator classes. Expressions are not supported as INCLUDE columns since they cannot be used in index-only scans. Index access methods supporting INCLUDE are indicated by amcaninclude flag in IndexAmRoutine. For now, only B-tree indexes support INCLUDE clause. In B-tree indexes INCLUDE columns are truncated from pivot index tuples (tuples located in non-leaf pages and high keys). Therefore, B-tree indexes now might have variable number of attributes. This patch also provides generic facility to support that: pivot tuples contain number of their attributes in t_tid.ip_posid. Free 13th bit of t_info is used for indicating that. This facility will simplify further support of index suffix truncation. The changes of above are backward-compatible, pg_upgrade doesn't need special handling of B-tree indexes for that. Bump catalog version Author: Anastasia Lubennikova with contribition by Alexander Korotkov and me Reviewed by: Peter Geoghegan, Tomas Vondra, Antonin Houska, Jeff Janes, David Rowley, Alexander Korotkov Discussion: https://www.postgresql.org/message-id/flat/56168952.4010101@postgrespro.ru
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@ -2889,6 +2889,7 @@ _copyConstraint(const Constraint *from)
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COPY_STRING_FIELD(cooked_expr);
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COPY_SCALAR_FIELD(generated_when);
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COPY_NODE_FIELD(keys);
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COPY_NODE_FIELD(including);
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COPY_NODE_FIELD(exclusions);
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COPY_NODE_FIELD(options);
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COPY_STRING_FIELD(indexname);
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@ -3464,6 +3465,7 @@ _copyIndexStmt(const IndexStmt *from)
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COPY_STRING_FIELD(accessMethod);
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COPY_STRING_FIELD(tableSpace);
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COPY_NODE_FIELD(indexParams);
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COPY_NODE_FIELD(indexIncludingParams);
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COPY_NODE_FIELD(options);
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COPY_NODE_FIELD(whereClause);
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COPY_NODE_FIELD(excludeOpNames);
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