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bpo-41724: Explain when the conversion is not possible with detect_types enabled (GH-23855) (GH-23863) 

* Explain when the conversion is not possible with detect_types enabled
(cherry picked from commit 09a36cdfb7)

Co-authored-by: sblondon <sblondon@users.noreply.github.com>
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Miss Islington (bot) 2020-12-19 16:02:58 -08:00 committed by GitHub
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Doc/library/sqlite3.rst
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@ -197,7 +197,9 @@ Module functions and constants
*detect_types* defaults to 0 (i. e. off, no type detection), you can set it to
any combination of :const:`PARSE_DECLTYPES` and :const:`PARSE_COLNAMES` to turn
type detection on.
type detection on. Due to SQLite behaviour, types can't be detected for generated
fields (for example ``max(data)``), even when *detect_types* parameter is set. In
such case, the returned type is :class:`str`.
By default, *check_same_thread* is :const:`True` and only the creating thread may
use the connection. If set :const:`False`, the returned connection may be shared