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Add get_bit/set_bit functions for bit strings, paralleling those for bytea,

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and implement OVERLAY() for bit strings and bytea.

In passing also convert text OVERLAY() to a true built-in, instead of
relying on a SQL function.

Leonardo F, reviewed by Kevin Grittner
This commit is contained in:
Tom Lane
2010-01-25 20:55:32 +00:00
parent 1d1f425f8d
commit 9507c8a1db
13 changed files with 554 additions and 93 deletions
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7
src/backend/parser/gram.y
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@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.704 2010/01/22 16:40:18 rhaas Exp $
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.705 2010/01/25 20:55:32 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -9586,9 +9586,9 @@ func_expr: func_name '(' ')' over_clause
| OVERLAY '(' overlay_list ')'
{
/* overlay(A PLACING B FROM C FOR D) is converted to
* substring(A, 1, C-1) || B || substring(A, C+1, C+D)
* overlay(A, B, C, D)
* overlay(A PLACING B FROM C) is converted to
* substring(A, 1, C-1) || B || substring(A, C+1, C+char_length(B))
* overlay(A, B, C)
*/
FuncCall *n = makeNode(FuncCall);
n->funcname = SystemFuncName("overlay");
@ -10150,6 +10150,7 @@ extract_arg:
* SQL99 defines the OVERLAY() function:
* o overlay(text placing text from int for int)
* o overlay(text placing text from int)
* and similarly for binary strings
*/
overlay_list:
a_expr overlay_placing substr_from substr_for