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Code Issues 32 Releases Wiki Activity

Refs #30897 -- Added support for ANALYZE option to Queryset.explain() on MariaDB and MySQL 8.0.18+.

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This commit is contained in:
Nick Pope
2019-10-21 17:34:19 +01:00
committed by Mariusz Felisiak
parent 742961332e
commit 55df1750be
5 changed files with 40 additions and 8 deletions
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4
django/db/backends/mysql/features.py
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@@ -117,6 +117,10 @@ class DatabaseFeatures(BaseDatabaseFeatures):
# EXTENDED is deprecated (and not required) in MySQL 5.7.
return not self.connection.mysql_is_mariadb and self.connection.mysql_version < (5, 7)
@cached_property
def supports_explain_analyze(self):
return self.connection.mysql_is_mariadb or self.connection.mysql_version >= (8, 0, 18)
@cached_property
def supported_explain_formats(self):
# Alias MySQL's TRADITIONAL to TEXT for consistency with other

11
django/db/backends/mysql/operations.py
View File

@@ -299,11 +299,16 @@ class DatabaseOperations(BaseDatabaseOperations):
elif not format and 'TREE' in self.connection.features.supported_explain_formats:
# Use TREE by default (if supported) as it's more informative.
format = 'TREE'
analyze = options.pop('analyze', False)
prefix = super().explain_query_prefix(format, **options)
if format:
if analyze and self.connection.features.supports_explain_analyze:
# MariaDB uses ANALYZE instead of EXPLAIN ANALYZE.
prefix = 'ANALYZE' if self.connection.mysql_is_mariadb else prefix + ' ANALYZE'
if format and not (analyze and not self.connection.mysql_is_mariadb):
# Only MariaDB supports the analyze option with formats.
prefix += ' FORMAT=%s' % format
if self.connection.features.needs_explain_extended and format is None:
# EXTENDED and FORMAT are mutually exclusive options.
if self.connection.features.needs_explain_extended and not analyze and format is None:
# ANALYZE, EXTENDED, and FORMAT are mutually exclusive options.
prefix += ' EXTENDED'
return prefix