postgres

Commit Graph

Author	SHA1	Message	Date
Tom Lane	e4186762ff	Adjust nodeFunctionscan.c to reset transient memory context between calls to the table function, thus preventing memory leakage accumulation across calls. This means that SRFs need to be careful to distinguish permanent and local storage; adjust code and documentation accordingly. Patch by Joe Conway, very minor tweaks by Tom Lane.	24 years ago
Bruce Momjian	45e2544584	As discussed on several occasions previously, the new anonymous composite type capability makes it possible to create a system view based on a table function in a way that is hopefully palatable to everyone. The attached patch takes advantage of this, moving show_all_settings() from contrib/tablefunc into the backend (renamed all_settings(). It is defined as a builtin returning type RECORD. During initdb a system view is created to expose the same information presently available through SHOW ALL. For example: test=# select * from pg_settings where name like '%debug%'; name \| setting -----------------------+--------- debug_assertions \| on debug_pretty_print \| off debug_print_parse \| off debug_print_plan \| off debug_print_query \| off debug_print_rewritten \| off wal_debug \| 0 (7 rows) Additionally during initdb two rules are created which make it possible to change settings by updating the system view -- a "virtual table" as Tom put it. Here's an example: Joe Conway	24 years ago
Bruce Momjian	41f862ba87	As mentioned above, here is my contrib/tablefunc patch. It includes three functions which exercise the tablefunc API. show_all_settings() - returns the same information as SHOW ALL, but as a query result normal_rand(int numvals, float8 mean, float8 stddev, int seed) - returns a set of normally distributed float8 values - This routine implements Algorithm P (Polar method for normal deviates) from Knuth's _The_Art_of_Computer_Programming_, Volume 2, 3rd ed., pages 122-126. Knuth cites his source as "The polar method", G. E. P. Box, M. E. Muller, and G. Marsaglia, _Annals_Math,_Stat._ 29 (1958), 610-611. crosstabN(text sql) - returns a set of row_name plus N category value columns - crosstab2(), crosstab3(), and crosstab4() are defined for you, but you can create additional crosstab functions per directions in the README. Joe Conway	24 years ago

Author

SHA1

Message

Date

Tom Lane

e4186762ff

Adjust nodeFunctionscan.c to reset transient memory context between calls

to the table function, thus preventing memory leakage accumulation across
calls.  This means that SRFs need to be careful to distinguish permanent
and local storage; adjust code and documentation accordingly.  Patch by
Joe Conway, very minor tweaks by Tom Lane.

24 years ago

Bruce Momjian

45e2544584

As discussed on several occasions previously, the new anonymous

composite type capability makes it possible to create a system view
based on a table function in a way that is hopefully palatable to
everyone. The attached patch takes advantage of this, moving
show_all_settings() from contrib/tablefunc into the backend (renamed
all_settings(). It is defined as a builtin returning type RECORD. During
initdb a system view is created to expose the same information presently
available through SHOW ALL. For example:

test=# select * from pg_settings where name like '%debug%';
          name          | setting
-----------------------+---------
  debug_assertions      | on
  debug_pretty_print    | off
  debug_print_parse     | off
  debug_print_plan      | off
  debug_print_query     | off
  debug_print_rewritten | off
  wal_debug             | 0
(7 rows)


Additionally during initdb two rules are created which make it possible
to change settings by updating the system view -- a "virtual table" as
Tom put it. Here's an example:

Joe Conway

24 years ago

Bruce Momjian

41f862ba87

As mentioned above, here is my contrib/tablefunc patch. It includes

three functions which exercise the tablefunc API.

show_all_settings()
   - returns the same information as SHOW ALL, but as a query result

normal_rand(int numvals, float8 mean, float8 stddev, int seed)
   - returns a set of normally distributed float8 values
   - This routine implements Algorithm P (Polar method for normal
     deviates) from Knuth's _The_Art_of_Computer_Programming_, Volume 2,
     3rd ed., pages 122-126. Knuth cites his source as "The polar
     method", G. E. P. Box, M. E. Muller, and G. Marsaglia,
     _Annals_Math,_Stat._ 29 (1958), 610-611.

crosstabN(text sql)
   - returns a set of row_name plus N category value columns
   - crosstab2(), crosstab3(), and crosstab4() are defined for you,
     but you can create additional crosstab functions per directions
     in the README.

Joe Conway

24 years ago

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103 Commits (d891c49286bb138dcd70df1dff83e22fa757fc84)