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From: Jacobo Sánchez López <[email protected]>
To: [email protected]
Subject: Substitution of convert function "{fn CONVERT(1, SQL_BIGINT)}" to text litreral '1'
Date: Mon, 16 Jan 2023 16:42:06 +0100
Message-ID: <[email protected]> (raw)

Hi

     I am doing some tests and found that when using a query with the 
convert function like

SELECT SUM({fn CONVERT(1, SQL_BIGINT)})

     It gets translated to

SELECT SUM('1')

     Which fails due to the aggregation function receiving a text 
literal instead of a number.

     I have narrowed down to this line in convert.c 
(https://git.postgresql.org/gitweb/?p=psqlodbc.git;a=blob;f=convert.c;h=d94fdb685df0a3430a13650f5140b...) 
deciding to add the quotes:

5743 else if (isdigit((unsigned char) *pptr))
5744                     add_quote = TRUE;

     How expected is that convert function to produce a text literal 
which makes the query to fail?


     The simpliest way to reproduce it I found is with a python script 
using a DSN called PostgreSQL35W (tested with version 13.02.0000):


importpyodbc
query= "SELECT SUM({fn CONVERT(1, SQL_INTEGER)})"
connection= pyodbc.connect('DSN=PostgreSQL35W',autocommit=True)
cursor= connection.cursor()
cursor.execute(query)
forrowincursor.fetchall():
print(row)


Best regards,

Jacobo

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