Commit221b377

committed

Improve comment for att_isnull.

The comment implies that a 1 in the null bitmap indicates a null value,but actually a 0 in the null bitmap indicates a null value. Try tobe more clear.Patch by me; proposed wording reviewed by Alvaro Herrera and Tom Lane.Discussion:http://postgr.es/m/CA+TgmobHOP8r6cG+UnsDFMrS30-m=jRrCBhgw-nFkn0k9QnFsg@mail.gmail.com

1 parentddf927f commit221b377Copy full SHA for 221b377

File tree

-1

lines changed

-1

lines changed

Lines changed: 3 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -16,7 +16,9 @@`
`16`	`16`
`17`	`17`
`18`	`18`	`/*`
`19`		`- * check to see if the ATT'th bit of an array of 8-bit bytes is set.`
	`19`	`+ * Check a tuple's null bitmap to determine whether the attribute is null.`
	`20`	`+ * Note that a 0 in the null bitmap indicates a null, while 1 indicates`
	`21`	`+ * non-null.`
`20`	`22`	`*/`
`21`	`23`	`#defineatt_isnull(ATT,BITS) (!((BITS)[(ATT) >> 3] & (1 << ((ATT) & 0x07))))`
`22`	`24`

Comments

(0)