Add IF NOT EXISTS processing to ALTER TABLE ADD COLUMN
Fabrízio de Royes Mello, reviewed by Payal Singh, Alvaro Herrera and Michael Paquier.
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- doc/src/sgml/ref/alter_table.sgml 5 additions, 3 deletionsdoc/src/sgml/ref/alter_table.sgml
- src/backend/commands/tablecmds.c 37 additions, 15 deletionssrc/backend/commands/tablecmds.c
- src/backend/parser/gram.y 20 additions, 0 deletionssrc/backend/parser/gram.y
- src/test/regress/expected/alter_table.out 89 additions, 0 deletionssrc/test/regress/expected/alter_table.out
- src/test/regress/sql/alter_table.sql 31 additions, 0 deletionssrc/test/regress/sql/alter_table.sql
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