Add way to retrieve statement BLR with Statement::getInfo and ISQL's SET EXEC_PATH_DISPLAY BLR

[asfernandes]

Info codes to be used with Statement::getInfo:

#define isc_info_sql_exec_path_blr_bytes	31
#define isc_info_sql_exec_path_blr_text		32

To make isc_info_sql_exec_path_blr_* work, session must be first execute set debug option dsql_keep_blr = true.

ISQL command:

In ISQL, set debug option must not be used directly, instead user should use set exec_path_display blr.

SET EXEC_PATH_DISPLAY BLR/OFF

Retrieves the execution path of a DML statement formatted as BLR text.

Warning: this feature is very tied to engine internals and its usage is discouraged
if you do not understand very well how these internals are subject to change between
versions.

[pavel-zotov]

Sent letter to Adriano, 28.07.2021 17:32, waiting for reply.

[asfernandes]

Sent letter to Adriano, 28.07.2021 17:32, waiting for reply.

Unfortunately it was only working with embedded.

I've rolled back the feature and will think in another way to implement it.