Windows env returns error while running "select pgstatindex"

Description:
===========

Error Message " invalid input syntax for type double precision: -1#I" is
displayed while running "select pgstatindex"

Issue only getting reproduce on windows environment.

Analysis:
=========

Consider the following testcase to reproduce the issue on windows:

create table test (a int primary key );

Windows Output:
==============

psql>select pgstatindex('public.test_pkey');
ERROR: invalid input syntax for type double precision: "-1.#J"

Linux output:
==========

psql=# select pgstatindex('public.test_pkey');
pgstatindex
---------------------------
(2,0,0,0,0,0,0,0,NaN,NaN)
(1 row)

here when we run the select on linux its returning proper result and on
windows error coming from float8in() while trying to work for the NaN
values.

After debugging I noticed that "0/0" returning NaN on linux but it returns
"-1.#JIND0000" on windows. Now when float8in() getting call for such value
on windows it ending up with error "invalid input syntax for type double
precision:" as strtod() not able to understand such values.

I added to check into pgstatindex() to avoid "0/0" situation and issue got
fixed.

PFA patch for the same.

Thanks,
Rushabh Lathia

EnterpriseDB Corporation
The Enterprise Postgres Company

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