Update copyright for 2022

Backpatch-through: 10

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) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2022, 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) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2022, 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) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/optimizer/prep/preptlist.c

@@ -25,7 +25,7 @@
  * rewriter's work is more concerned with SQL semantics.
  *
  *
- * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2022, 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) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *