Performance improvement for lexing long strings: increase flex's

tglsfdc · tglsfdc · commit a84c95634e2c · 2000-03-13T01:52:06.000Z
YY_READ_BUF_SIZE, which turns out to have nothing to do with buffer size.
It's just a totally arbitrary upper limit on how much data myinput() is
asked for at one time.
diff --git a/src/backend/parser/scan.l b/src/backend/parser/scan.l
@@ -9,7 +9,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/parser/scan.l,v 1.66 2000/03/11 05:14:06 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/parser/scan.l,v 1.67 2000/03/13 01:52:06 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -47,6 +47,9 @@ static int myinput(char* buf, int max);
 #undef YY_INPUT
 #define YY_INPUT(buf,result,max) {result = myinput(buf,max);}
 
+/* No reason to constrain amount of data slurped per myinput() call. */
+#define YY_READ_BUF_SIZE 16777216
+
 #else /* !FLEX_SCANNER */
 
 #undef input

Original file line number	Diff line number	Diff line change
`@@ -9,7 +9,7 @@`
`9`	`9`	`*`
`10`	`10`	`*`
`11`	`11`	`* IDENTIFICATION`
`12`		`- * $Header: /cvsroot/pgsql/src/backend/parser/scan.l,v 1.66 2000/03/11 05:14:06 tgl Exp $`
	`12`	`+ * $Header: /cvsroot/pgsql/src/backend/parser/scan.l,v 1.67 2000/03/13 01:52:06 tgl Exp $`
`13`	`13`	`*`
`14`	`14`	`*-------------------------------------------------------------------------`
`15`	`15`	`*/`
`@@ -47,6 +47,9 @@ static int myinput(char* buf, int max);`
`47`	`47`	`#undef YY_INPUT`
`48`	`48`	`#define YY_INPUT(buf,result,max) {result = myinput(buf,max);}`
`49`	`49`
	`50`	`+/* No reason to constrain amount of data slurped per myinput() call. */`
	`51`	`+#define YY_READ_BUF_SIZE 16777216`
	`52`	`+`
`50`	`53`	`#else /* !FLEX_SCANNER */`
`51`	`54`
`52`	`55`	`#undef input`