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Allow forcing nullness of columns during bootstrap.

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Bootstrap determines whether a column is null based on simple builtin
rules. Those work surprisingly well, but nonetheless a few existing
columns aren't set correctly. Additionally there is at least one patch
sent to hackers where forcing the nullness of a column would be helpful.

The boostrap format has gained FORCE [NOT] NULL for this, which will be
emitted by genbki.pl when BKI_FORCE_(NOT_)?NULL is specified for a
column in a catalog header.

This patch doesn't change the marking of any existing columns.

Discussion: 20150215170014.GE15326@awork2.anarazel.de
This commit is contained in:
Andres Freund
2015-02-21 22:25:49 +01:00
parent 0627eff360
commit eb68379c38
9 changed files with 131 additions and 49 deletions
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6
src/include/bootstrap/bootstrap.h
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@@ -23,6 +23,10 @@
*/
#define MAXATTR 40
#define BOOTCOL_NULL_AUTO 1
#define BOOTCOL_NULL_FORCE_NULL 2
#define BOOTCOL_NULL_FORCE_NOT_NULL 3
extern Relation boot_reldesc;
extern Form_pg_attribute attrtypes[MAXATTR];
extern int numattr;
@@ -35,7 +39,7 @@ extern void err_out(void);
extern void closerel(char *name);
extern void boot_openrel(char *name);
extern void DefineAttr(char *name, char *type, int attnum);
extern void DefineAttr(char *name, char *type, int attnum, int nullness);
extern void InsertOneTuple(Oid objectid);
extern void InsertOneValue(char *value, int i);
extern void InsertOneNull(int i);