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Translate to NULLIF
Closes #31682
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6 files changed

+247
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‎EFCore.sln.DotSettings‎

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@@ -356,7 +356,9 @@ The .NET Foundation licenses this file to you under the MIT license.
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<s:Boolean x:Key="/Default/UserDictionary/Words/=subquery/@EntryIndexedValue">True</s:Boolean>
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<s:Boolean x:Key="/Default/UserDictionary/Words/=subquery_0027s/@EntryIndexedValue">True</s:Boolean>
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<s:Boolean x:Key="/Default/UserDictionary/Words/=transactionality/@EntryIndexedValue">True</s:Boolean>
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<s:Boolean x:Key="/Default/UserDictionary/Words/=uncoalescing/@EntryIndexedValue">True</s:Boolean>
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<s:Boolean x:Key="/Default/UserDictionary/Words/=unconfigured/@EntryIndexedValue">True</s:Boolean>
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<s:Boolean x:Key="/Default/UserDictionary/Words/=unequality/@EntryIndexedValue">True</s:Boolean>
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<s:Boolean x:Key="/Default/UserDictionary/Words/=unignore/@EntryIndexedValue">True</s:Boolean>
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<s:Boolean x:Key="/Default/UserDictionary/Words/=fixup/@EntryIndexedValue">True</s:Boolean>
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<s:Boolean x:Key="/Default/UserDictionary/Words/=attacher/@EntryIndexedValue">True</s:Boolean>

‎src/EFCore.Relational/Query/SqlExpressionFactory.cs‎

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@@ -825,6 +825,31 @@ public virtual SqlExpression Case(
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elseResult = lastCase.ElseResult;
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}
827827

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// Optimize:
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// a == b ? null : a -> NULLIF(a, b)
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// a != b ? a : null -> NULLIF(a, b)
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if (operand is null
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&& typeMappedWhenClauses is
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[
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{
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Test: SqlBinaryExpression { OperatorType: ExpressionType.Equal or ExpressionType.NotEqual } binary,
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Result: var result
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}
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])
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{
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switch (binary.OperatorType)
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{
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case ExpressionType.Equal
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when result is SqlConstantExpression { Value: null }
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&& elseResult is not null
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&& TryTranslateToNullIf(elseResult, out var nullIfTranslation):
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case ExpressionType.NotEqual
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when elseResult is null or SqlConstantExpression { Value: null }
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&& TryTranslateToNullIf(result, out nullIfTranslation):
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return nullIfTranslation;
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}
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}
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return existingExpression is CaseExpression expr
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&& operand == expr.Operand
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&& typeMappedWhenClauses.SequenceEqual(expr.WhenClauses)
@@ -837,6 +862,28 @@ bool IsSkipped(CaseWhenClause clause)
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838863
bool IsMatched(CaseWhenClause clause)
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=> operand is null && clause.Test is SqlConstantExpression { Value: true };
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bool TryTranslateToNullIf(SqlExpression conditionalResult, [NotNullWhen(true)] out SqlExpression? nullIfTranslation)
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{
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var (left, right) = (binary.Left, binary.Right);
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if (left.Equals(conditionalResult) && right is not SqlConstantExpression { Value: null })
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{
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nullIfTranslation = Function(
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"NULLIF", [left, right], true, [false, false], left.Type, left.TypeMapping);
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return true;
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}
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if (right.Equals(conditionalResult) && right is not SqlConstantExpression { Value: null })
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{
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nullIfTranslation = Function(
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"NULLIF", [right, left], true, [false, false], right.Type, right.TypeMapping);
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return true;
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}
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nullIfTranslation = null;
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return false;
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}
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}
841888

842889
/// <inheritdoc />

‎test/EFCore.Cosmos.FunctionalTests/Query/Translations/MiscellaneousTranslationsCosmosTest.cs‎

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@@ -175,6 +175,66 @@ public override async Task TimeSpan_Compare_to_simple_zero(bool async, bool comp
175175

176176
#endregion Compare
177177

178+
#region Uncoalescing conditional / NullIf
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public override Task Uncoalescing_conditional_with_equality_left(bool async)
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=> Fixture.NoSyncTest(
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async, async a =>
183+
{
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await base.Uncoalescing_conditional_with_equality_left(a);
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AssertSql(
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"""
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SELECT VALUE c
189+
FROM root c
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WHERE (((c["Int"] = 9) ? null : c["Int"]) > 1)
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""");
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});
193+
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public override Task Uncoalescing_conditional_with_equality_right(bool async)
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=> Fixture.NoSyncTest(
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async, async a =>
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{
198+
await base.Uncoalescing_conditional_with_equality_right(a);
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200+
AssertSql(
201+
"""
202+
SELECT VALUE c
203+
FROM root c
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WHERE (((9 = c["Int"]) ? null : c["Int"]) > 1)
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""");
206+
});
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public override Task Uncoalescing_conditional_with_unequality_left(bool async)
209+
=> Fixture.NoSyncTest(
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async, async a =>
211+
{
212+
await base.Uncoalescing_conditional_with_unequality_left(a);
213+
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AssertSql(
215+
"""
216+
SELECT VALUE c
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FROM root c
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WHERE (((c["Int"] != 9) ? c["Int"] : null) > 1)
219+
""");
220+
});
221+
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public override Task Uncoalescing_conditional_with_inequality_right(bool async)
223+
=> Fixture.NoSyncTest(
224+
async, async a =>
225+
{
226+
await base.Uncoalescing_conditional_with_inequality_right(a);
227+
228+
AssertSql(
229+
"""
230+
SELECT VALUE c
231+
FROM root c
232+
WHERE (((9 != c["Int"]) ? c["Int"] : null) > 1)
233+
""");
234+
});
235+
236+
#endregion Uncoalescing conditional / NullIf
237+
178238
[ConditionalFact]
179239
public virtual void Check_all_tests_overridden()
180240
=> TestHelpers.AssertAllMethodsOverridden(GetType());

‎test/EFCore.Specification.Tests/Query/Translations/MiscellaneousTranslationsTestBase.cs‎

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Original file line numberDiff line numberDiff line change
@@ -429,4 +429,38 @@ await AssertQuery(
429429
}
430430

431431
#endregion
432+
433+
#region Uncoalescing conditional
434+
435+
// In relational providers, x == a ? null : x is translated to SQL NULLIF
436+
437+
[Theory]
438+
[MemberData(nameof(IsAsyncData))]
439+
public virtual Task Uncoalescing_conditional_with_equality_left(bool async)
440+
=> AssertQuery(
441+
async,
442+
cs => cs.Set<BasicTypesEntity>().Where(x => (x.Int == 9 ? null : x.Int) > 1));
443+
444+
[Theory]
445+
[MemberData(nameof(IsAsyncData))]
446+
public virtual Task Uncoalescing_conditional_with_equality_right(bool async)
447+
=> AssertQuery(
448+
async,
449+
cs => cs.Set<BasicTypesEntity>().Where(x => (9 == x.Int ? null : x.Int) > 1));
450+
451+
[Theory]
452+
[MemberData(nameof(IsAsyncData))]
453+
public virtual Task Uncoalescing_conditional_with_unequality_left(bool async)
454+
=> AssertQuery(
455+
async,
456+
cs => cs.Set<BasicTypesEntity>().Where(x => (x.Int != 9 ? x.Int : null) > 1));
457+
458+
[Theory]
459+
[MemberData(nameof(IsAsyncData))]
460+
public virtual Task Uncoalescing_conditional_with_inequality_right(bool async)
461+
=> AssertQuery(
462+
async,
463+
cs => cs.Set<BasicTypesEntity>().Where(x => (9 != x.Int ? x.Int : null) > 1));
464+
465+
#endregion Uncoalescing conditional
432466
}

‎test/EFCore.SqlServer.FunctionalTests/Query/Translations/MiscellaneousTranslationsSqlServerTest.cs‎

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@@ -803,6 +803,58 @@ FROM [BasicTypesEntities] AS [b]
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804804
#endregion Compare
805805

806+
#region Uncoalescing conditional / NullIf
807+
808+
public override async Task Uncoalescing_conditional_with_equality_left(bool async)
809+
{
810+
await base.Uncoalescing_conditional_with_equality_left(async);
811+
812+
AssertSql(
813+
"""
814+
SELECT [b].[Id], [b].[Bool], [b].[Byte], [b].[ByteArray], [b].[DateOnly], [b].[DateTime], [b].[DateTimeOffset], [b].[Decimal], [b].[Double], [b].[Enum], [b].[FlagsEnum], [b].[Float], [b].[Guid], [b].[Int], [b].[Long], [b].[Short], [b].[String], [b].[TimeOnly], [b].[TimeSpan]
815+
FROM [BasicTypesEntities] AS [b]
816+
WHERE NULLIF([b].[Int], 9) > 1
817+
""");
818+
}
819+
820+
public override async Task Uncoalescing_conditional_with_equality_right(bool async)
821+
{
822+
await base.Uncoalescing_conditional_with_equality_right(async);
823+
824+
AssertSql(
825+
"""
826+
SELECT [b].[Id], [b].[Bool], [b].[Byte], [b].[ByteArray], [b].[DateOnly], [b].[DateTime], [b].[DateTimeOffset], [b].[Decimal], [b].[Double], [b].[Enum], [b].[FlagsEnum], [b].[Float], [b].[Guid], [b].[Int], [b].[Long], [b].[Short], [b].[String], [b].[TimeOnly], [b].[TimeSpan]
827+
FROM [BasicTypesEntities] AS [b]
828+
WHERE NULLIF([b].[Int], 9) > 1
829+
""");
830+
}
831+
832+
public override async Task Uncoalescing_conditional_with_unequality_left(bool async)
833+
{
834+
await base.Uncoalescing_conditional_with_unequality_left(async);
835+
836+
AssertSql(
837+
"""
838+
SELECT [b].[Id], [b].[Bool], [b].[Byte], [b].[ByteArray], [b].[DateOnly], [b].[DateTime], [b].[DateTimeOffset], [b].[Decimal], [b].[Double], [b].[Enum], [b].[FlagsEnum], [b].[Float], [b].[Guid], [b].[Int], [b].[Long], [b].[Short], [b].[String], [b].[TimeOnly], [b].[TimeSpan]
839+
FROM [BasicTypesEntities] AS [b]
840+
WHERE NULLIF([b].[Int], 9) > 1
841+
""");
842+
}
843+
844+
public override async Task Uncoalescing_conditional_with_inequality_right(bool async)
845+
{
846+
await base.Uncoalescing_conditional_with_inequality_right(async);
847+
848+
AssertSql(
849+
"""
850+
SELECT [b].[Id], [b].[Bool], [b].[Byte], [b].[ByteArray], [b].[DateOnly], [b].[DateTime], [b].[DateTimeOffset], [b].[Decimal], [b].[Double], [b].[Enum], [b].[FlagsEnum], [b].[Float], [b].[Guid], [b].[Int], [b].[Long], [b].[Short], [b].[String], [b].[TimeOnly], [b].[TimeSpan]
851+
FROM [BasicTypesEntities] AS [b]
852+
WHERE NULLIF([b].[Int], 9) > 1
853+
""");
854+
}
855+
856+
#endregion Uncoalescing conditional / NullIf
857+
806858
[ConditionalFact]
807859
public virtual void Check_all_tests_overridden()
808860
=> TestHelpers.AssertAllMethodsOverridden(GetType());

‎test/EFCore.Sqlite.FunctionalTests/Query/Translations/MiscellaneousTranslationsSqliteTest.cs‎

Lines changed: 52 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -274,6 +274,58 @@ public override async Task TimeSpan_Compare_to_simple_zero(bool async, bool comp
274274

275275
#endregion Compare
276276

277+
#region Uncoalescing conditional / NullIf
278+
279+
public override async Task Uncoalescing_conditional_with_equality_left(bool async)
280+
{
281+
await base.Uncoalescing_conditional_with_equality_left(async);
282+
283+
AssertSql(
284+
"""
285+
SELECT "b"."Id", "b"."Bool", "b"."Byte", "b"."ByteArray", "b"."DateOnly", "b"."DateTime", "b"."DateTimeOffset", "b"."Decimal", "b"."Double", "b"."Enum", "b"."FlagsEnum", "b"."Float", "b"."Guid", "b"."Int", "b"."Long", "b"."Short", "b"."String", "b"."TimeOnly", "b"."TimeSpan"
286+
FROM "BasicTypesEntities" AS "b"
287+
WHERE NULLIF("b"."Int", 9) > 1
288+
""");
289+
}
290+
291+
public override async Task Uncoalescing_conditional_with_equality_right(bool async)
292+
{
293+
await base.Uncoalescing_conditional_with_equality_right(async);
294+
295+
AssertSql(
296+
"""
297+
SELECT "b"."Id", "b"."Bool", "b"."Byte", "b"."ByteArray", "b"."DateOnly", "b"."DateTime", "b"."DateTimeOffset", "b"."Decimal", "b"."Double", "b"."Enum", "b"."FlagsEnum", "b"."Float", "b"."Guid", "b"."Int", "b"."Long", "b"."Short", "b"."String", "b"."TimeOnly", "b"."TimeSpan"
298+
FROM "BasicTypesEntities" AS "b"
299+
WHERE NULLIF("b"."Int", 9) > 1
300+
""");
301+
}
302+
303+
public override async Task Uncoalescing_conditional_with_unequality_left(bool async)
304+
{
305+
await base.Uncoalescing_conditional_with_unequality_left(async);
306+
307+
AssertSql(
308+
"""
309+
SELECT "b"."Id", "b"."Bool", "b"."Byte", "b"."ByteArray", "b"."DateOnly", "b"."DateTime", "b"."DateTimeOffset", "b"."Decimal", "b"."Double", "b"."Enum", "b"."FlagsEnum", "b"."Float", "b"."Guid", "b"."Int", "b"."Long", "b"."Short", "b"."String", "b"."TimeOnly", "b"."TimeSpan"
310+
FROM "BasicTypesEntities" AS "b"
311+
WHERE NULLIF("b"."Int", 9) > 1
312+
""");
313+
}
314+
315+
public override async Task Uncoalescing_conditional_with_inequality_right(bool async)
316+
{
317+
await base.Uncoalescing_conditional_with_inequality_right(async);
318+
319+
AssertSql(
320+
"""
321+
SELECT "b"."Id", "b"."Bool", "b"."Byte", "b"."ByteArray", "b"."DateOnly", "b"."DateTime", "b"."DateTimeOffset", "b"."Decimal", "b"."Double", "b"."Enum", "b"."FlagsEnum", "b"."Float", "b"."Guid", "b"."Int", "b"."Long", "b"."Short", "b"."String", "b"."TimeOnly", "b"."TimeSpan"
322+
FROM "BasicTypesEntities" AS "b"
323+
WHERE NULLIF("b"."Int", 9) > 1
324+
""");
325+
}
326+
327+
#endregion Uncoalescing conditional / NullIf
328+
277329
[ConditionalFact]
278330
public virtual void Check_all_tests_overridden()
279331
=> TestHelpers.AssertAllMethodsOverridden(GetType());

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