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Tom Lane c9d5298485 Re-implement pl/pgsql's expression and assignment parsing. 
Invent new RawParseModes that allow the core grammar to handle
pl/pgsql expressions and assignments directly, and thereby get rid
of a lot of hackery in pl/pgsql's parser.  This moves a good deal
of knowledge about pl/pgsql into the core code: notably, we have to
invent a CoercionContext that matches pl/pgsql's (rather dubious)
historical behavior for assignment coercions.  That's getting away
from the original idea of pl/pgsql as an arm's-length extension of
the core, but really we crossed that bridge a long time ago.

The main advantage of doing this is that we can now use the core
parser to generate FieldStore and/or SubscriptingRef nodes to handle
assignments to pl/pgsql variables that are records or arrays.  That
fixes a number of cases that had never been implemented in pl/pgsql
assignment, such as nested records and array slicing, and it allows
pl/pgsql assignment to support the datatype-specific subscripting
behaviors introduced in commit c7aba7c14.

There are cosmetic benefits too: when a syntax error occurs in a
pl/pgsql expression, the error report no longer includes the confusing
"SELECT" keyword that used to get prefixed to the expression text.
Also, there seem to be some small speed gains.

Discussion: https://postgr.es/m/4165684.1607707277@sss.pgh.pa.us
2021-01-04 11:52:00 -05:00
..
compatlib Update copyright for 2021 2021-01-02 13:06:25 -05:00
ecpglib Update copyright for 2021 2021-01-02 13:06:25 -05:00
include Make the order of the header file includes consistent. 2019-11-25 08:08:57 +05:30
pgtypeslib Update copyright for 2021 2021-01-02 13:06:25 -05:00
preproc Re-implement pl/pgsql's expression and assignment parsing. 2021-01-04 11:52:00 -05:00
test Update copyright for 2021 2021-01-02 13:06:25 -05:00
Makefile Use https for gnu.org links 2020-10-14 08:24:54 +02:00
README.dynSQL Fix whitespace issues found by git diff --check, add gitattributes 2013-11-10 14:48:29 -05:00

README.dynSQL 

src/interfaces/ecpg/README.dynSQL

descriptor statements have the following shortcomings

- input descriptors (USING DESCRIPTOR <name>) are not supported

  Reason: to fully support dynamic SQL the frontend/backend communication
          should change to recognize input parameters.
          Since this is not likely to happen in the near future and you
          can cover the same functionality with the existing infrastructure
          (using s[n]printf), I'll leave the work to someone else.