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Change the parser to convert SQL "position" and "substring" syntax to

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position() and substring() functions, so that it works transparently for
bit types as well.  Alias the text functions appropriately.

Add position() for bit types.

Add new constant node T_BitString that represents literals of the form
B'1001 and pass those to zpbit type.
This commit is contained in:
Peter Eisentraut
2000-10-31 10:22:13 +00:00
parent d397c1c8a2
commit 73874a06f0
14 changed files with 214 additions and 47 deletions
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19
src/backend/nodes/read.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/read.c,v 1.23 2000/06/14 18:17:32 petere Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/read.c,v 1.24 2000/10/31 10:22:10 petere Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -17,11 +17,11 @@
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <ctype.h>
#include <errno.h>
#include "postgres.h"
#include "nodes/pg_list.h"
#include "nodes/readfuncs.h"
@ -184,7 +184,7 @@ debackslash(char *token, int length)
* nodeTokenType -
* returns the type of the node token contained in token.
* It returns one of the following valid NodeTags:
* T_Integer, T_Float, T_String
* T_Integer, T_Float, T_String, T_BitString
* and some of its own:
* RIGHT_PAREN, LEFT_PAREN, PLAN_SYM, AT_SYMBOL, ATOM_TOKEN
*
@ -236,6 +236,8 @@ nodeTokenType(char *token, int length)
retval = AT_SYMBOL;
else if (*token == '\"' && length > 1 && token[length - 1] == '\"')
retval = T_String;
else if (*token == 'B')
retval = T_BitString;
else
retval = ATOM_TOKEN;
return retval;
@ -346,6 +348,15 @@ nodeRead(bool read_car_only)
this_value = (Node *) makeString(debackslash(token + 1, tok_len - 2));
make_dotted_pair_cell = true;
break;
case T_BitString:
{
char * val = palloc(tok_len);
/* skip leading 'B'*/
strncpy(val, token + 1, tok_len - 1);
val[tok_len - 1] = '\0';
this_value = (Node *) makeBitString(val);
break;
}
default:
elog(ERROR, "nodeRead: Bad type %d", type);
this_value = NULL; /* keep compiler happy */