Update copyright for 2021

Backpatch-through: 9.5

src/backend/optimizer/geqo/geqo_copy.c

@@ -2,7 +2,7 @@
  *
  * geqo_copy.c
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/optimizer/geqo/geqo_copy.c

src/backend/optimizer/geqo/geqo_eval.c

@@ -3,7 +3,7 @@
  * geqo_eval.c
  *	  Routines to evaluate query trees
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/optimizer/geqo/geqo_eval.c

src/backend/optimizer/geqo/geqo_main.c

@@ -4,7 +4,7 @@
  *	  solution to the query optimization problem
  *	  by means of a Genetic Algorithm (GA)
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/optimizer/geqo/geqo_main.c

src/backend/optimizer/geqo/geqo_misc.c

@@ -3,7 +3,7 @@
  * geqo_misc.c
  *	   misc. printout and debug stuff
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/optimizer/geqo/geqo_misc.c

src/backend/optimizer/geqo/geqo_pool.c

@@ -3,7 +3,7 @@
  * geqo_pool.c
  *	  Genetic Algorithm (GA) pool stuff
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/optimizer/geqo/geqo_pool.c

src/backend/optimizer/geqo/geqo_random.c

@@ -3,7 +3,7 @@
  * geqo_random.c
  *	   random number generator
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/optimizer/geqo/geqo_random.c

src/backend/optimizer/geqo/geqo_selection.c

@@ -3,7 +3,7 @@
  * geqo_selection.c
  *	  linear selection scheme for the genetic query optimizer
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/optimizer/geqo/geqo_selection.c

src/backend/optimizer/path/allpaths.c

@@ -3,7 +3,7 @@
  * allpaths.c
  *	  Routines to find possible search paths for processing a query
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/path/clausesel.c

@@ -3,7 +3,7 @@
  * clausesel.c
  *	  Routines to compute clause selectivities
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/path/costsize.c

@@ -60,7 +60,7 @@
  * values.
  *
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION

src/backend/optimizer/path/equivclass.c

@@ -6,7 +6,7 @@
  * See src/backend/optimizer/README for discussion of EquivalenceClasses.
  *
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION

src/backend/optimizer/path/indxpath.c

@@ -4,7 +4,7 @@
  *	  Routines to determine which indexes are usable for scanning a
  *	  given relation, and create Paths accordingly.
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/path/joinpath.c

@@ -3,7 +3,7 @@
  * joinpath.c
  *	  Routines to find all possible paths for processing a set of joins
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/path/joinrels.c

@@ -3,7 +3,7 @@
  * joinrels.c
  *	  Routines to determine which relations should be joined
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/path/pathkeys.c

@@ -7,7 +7,7 @@
  * the nature and use of path keys.
  *
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION

src/backend/optimizer/path/tidpath.c

@@ -24,7 +24,7 @@
  * representation all the way through to execution.
  *
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/plan/analyzejoins.c

@@ -11,7 +11,7 @@
  * is that we have to work harder to clean up after ourselves when we modify
  * the query, since the derived data structures have to be updated too.
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/plan/createplan.c

@@ -5,7 +5,7 @@
  *	  Planning is complete, we just need to convert the selected
  *	  Path into a Plan.
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/plan/initsplan.c

@@ -3,7 +3,7 @@
  * initsplan.c
  *	  Target list, qualification, joininfo initialization routines
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/plan/planagg.c

@@ -17,7 +17,7 @@
  * scan all the rows anyway.
  *
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/plan/planmain.c

@@ -9,7 +9,7 @@
  * shorn of features like subselects, inheritance, aggregates, grouping,
  * and so on.  (Those are the things planner.c deals with.)
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/plan/planner.c

@@ -3,7 +3,7 @@
  * planner.c
  *	  The query optimizer external interface.
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/plan/setrefs.c

@@ -4,7 +4,7 @@
  *	  Post-processing of a completed plan tree: fix references to subplan
  *	  vars, compute regproc values for operators, etc
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/plan/subselect.c

@@ -6,7 +6,7 @@
  * This module deals with SubLinks and CTEs, but not subquery RTEs (i.e.,
  * not sub-SELECT-in-FROM cases).
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION

src/backend/optimizer/prep/prepagg.c

@@ -22,7 +22,7 @@
  * at executor startup.  The Agg nodes are constructed much later in the
  * planning, however, so it's not trivial.
  *
- * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/prep/prepjointree.c

@@ -14,7 +14,7 @@
  *		remove_useless_result_rtes
  *
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/prep/prepqual.c

@@ -19,7 +19,7 @@
  * tree after local transformations that might introduce nested AND/ORs.
  *
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/prep/preptlist.c

@@ -29,7 +29,7 @@
  * that because it's faster in typical non-inherited cases.
  *
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION

src/backend/optimizer/prep/prepunion.c

@@ -12,7 +12,7 @@
  * case, but most of the heavy lifting for that is done elsewhere,
  * notably in prepjointree.c and allpaths.c.
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/util/appendinfo.c

@@ -3,7 +3,7 @@
  * appendinfo.c
  *	  Routines for mapping between append parent(s) and children
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/util/clauses.c

@@ -3,7 +3,7 @@
  * clauses.c
  *	  routines to manipulate qualification clauses
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/util/inherit.c

@@ -3,7 +3,7 @@
  * inherit.c
  *	  Routines to process child relations in inheritance trees
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/util/joininfo.c

@@ -3,7 +3,7 @@
  * joininfo.c
  *	  joininfo list manipulation routines
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/util/orclauses.c

@@ -3,7 +3,7 @@
  * orclauses.c
  *	  Routines to extract restriction OR clauses from join OR clauses
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/util/paramassign.c

@@ -40,7 +40,7 @@
  * doesn't really save much executor work anyway.
  *
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION

src/backend/optimizer/util/pathnode.c

@@ -3,7 +3,7 @@
  * pathnode.c
  *	  Routines to manipulate pathlists and create path nodes
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/util/placeholder.c

@@ -4,7 +4,7 @@
  *	  PlaceHolderVar and PlaceHolderInfo manipulation routines
  *
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/util/plancat.c

@@ -4,7 +4,7 @@
  *	   routines for accessing the system catalogs
  *
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/util/predtest.c

@@ -4,7 +4,7 @@
  *	  Routines to attempt to prove logical implications between predicate
  *	  expressions.
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/util/relnode.c

@@ -3,7 +3,7 @@
  * relnode.c
  *	  Relation-node lookup/construction routines
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/util/restrictinfo.c

@@ -3,7 +3,7 @@
  * restrictinfo.c
  *	  RestrictInfo node manipulation routines.
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/util/tlist.c

@@ -3,7 +3,7 @@
  * tlist.c
  *	  Target list manipulation routines
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/util/var.c

@@ -9,7 +9,7 @@
  * contains variables.
  *
  *
- * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *