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LINQ : Adds support for case-insensitive searches #1721

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merged 14 commits into from
Aug 4, 2020
Merged

LINQ : Adds support for case-insensitive searches #1721

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a730036
LINQ : Add support for case-insensitive searches
jeffpardy Jul 23, 2020
ffdce73
code review and additional baselines tests
jeffpardy Jul 24, 2020
31001cc
Merge branch 'master' into linq-case-insensitive
jeffpardy Jul 24, 2020
7ab7b6b
Merge branch 'master' into linq-case-insensitive
j82w Jul 24, 2020
f676347
Merge branch 'master' into linq-case-insensitive
j82w Jul 24, 2020
5390628
vary string case for baseline tests
jeffpardy Jul 25, 2020
bd4651c
comment supported overloads for string.Contains
jeffpardy Jul 25, 2020
4a61ba0
target 2.1 and remove contains testing methods
jeffpardy Jul 28, 2020
922c050
Merge remote-tracking branch 'upstream/master' into linq-case-insensi…
jeffpardy Jul 28, 2020
878ecf6
Merge branch 'master' into linq-case-insensitive
ealsur Jul 29, 2020
030baf5
Merge branch 'master' into linq-case-insensitive
ealsur Jul 29, 2020
92ae0c6
Merge branch 'master' into linq-case-insensitive
bchong95 Jul 31, 2020
8304e44
remove check for static method
jeffpardy Aug 3, 2020
834390f
Merge branch 'master' into linq-case-insensitive
jeffpardy Aug 3, 2020
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95 changes: 73 additions & 22 deletions Microsoft.Azure.Cosmos/src/Linq/BuiltinFunctions/StringBuiltinFunctions.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -55,25 +55,20 @@ public StringVisitContains()
false,
new List<Type[]>()
{
new Type[]{typeof(string)}
new Type[]{typeof(string)},
new Type[]{typeof(char)}
})
{
}

protected override SqlScalarExpression VisitImplicit(MethodCallExpression methodCallExpression, TranslationContext context)
{
if (methodCallExpression.Arguments.Count == 1)
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if (methodCallExpression.Arguments.Count == 2)
{
SqlScalarExpression haystack = ExpressionToSql.VisitScalarExpression(methodCallExpression.Object, context);
SqlScalarExpression needle = ExpressionToSql.VisitScalarExpression(methodCallExpression.Arguments[0], context);
return SqlFunctionCallScalarExpression.CreateBuiltin("CONTAINS", haystack, needle);
}
else if (methodCallExpression.Arguments.Count == 2)
{
SqlScalarExpression haystack = ExpressionToSql.VisitScalarExpression(methodCallExpression.Arguments[0], context);
SqlScalarExpression needle = ExpressionToSql.VisitScalarExpression(methodCallExpression.Arguments[1], context);
return SqlFunctionCallScalarExpression.CreateBuiltin("CONTAINS", haystack, needle);

SqlScalarExpression caseInsensitive = SqlStringWithComparisonVisitor.GetCaseInsensitiveExpression(methodCallExpression.Arguments[1]);
return SqlFunctionCallScalarExpression.CreateBuiltin("CONTAINS", haystack, needle, caseInsensitive);
}
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return null;
Expand Down Expand Up @@ -161,6 +156,63 @@ protected override SqlScalarExpression VisitImplicit(MethodCallExpression method
}
}

private sealed class SqlStringWithComparisonVisitor : BuiltinFunctionVisitor
{
private static readonly HashSet<StringComparison> IgnoreCaseComparisons = new HashSet<StringComparison>(new[]
{
StringComparison.CurrentCultureIgnoreCase,
StringComparison.InvariantCultureIgnoreCase,
StringComparison.OrdinalIgnoreCase
});

public string SqlName { get; }

public SqlStringWithComparisonVisitor(string sqlName)
{
this.SqlName = sqlName ?? throw new ArgumentNullException(nameof(sqlName));
}

public static SqlScalarExpression GetCaseInsensitiveExpression(Expression expression)
{
if (expression is ConstantExpression inputExpression
&& inputExpression.Value is StringComparison comparisonValue
&& IgnoreCaseComparisons.Contains(comparisonValue))
{
SqlBooleanLiteral literal = SqlBooleanLiteral.Create(true);
return SqlLiteralScalarExpression.Create(literal);
}

return null;
}
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protected override SqlScalarExpression VisitImplicit(MethodCallExpression methodCallExpression, TranslationContext context)
{
int argumentCount = methodCallExpression.Arguments.Count;
if (argumentCount == 0 || argumentCount > 2)
{
return null;
}

List<SqlScalarExpression> arguments = new List<SqlScalarExpression>
{
ExpressionToSql.VisitNonSubqueryScalarExpression(methodCallExpression.Object, context),
ExpressionToSql.VisitNonSubqueryScalarExpression(methodCallExpression.Arguments[0], context)
};

if (argumentCount > 1)
{
arguments.Add(GetCaseInsensitiveExpression(methodCallExpression.Arguments[1]));
}

return SqlFunctionCallScalarExpression.CreateBuiltin(this.SqlName, arguments.ToArray());
}

protected override SqlScalarExpression VisitExplicit(MethodCallExpression methodCallExpression, TranslationContext context)
{
return null;
}
}

private class StringVisitTrimEnd : SqlBuiltinFunctionVisitor
{
public StringVisitTrimEnd()
Expand Down Expand Up @@ -240,6 +292,15 @@ protected override SqlScalarExpression VisitImplicit(MethodCallExpression method
return SqlBinaryScalarExpression.Create(SqlBinaryScalarOperatorKind.Equal, left, right);
}

if (methodCallExpression.Arguments.Count == 2)
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{
SqlScalarExpression left = ExpressionToSql.VisitScalarExpression(methodCallExpression.Object, context);
SqlScalarExpression right = ExpressionToSql.VisitScalarExpression(methodCallExpression.Arguments[0], context);
SqlScalarExpression caseInsensitive = SqlStringWithComparisonVisitor.GetCaseInsensitiveExpression(methodCallExpression.Arguments[1]);

return SqlFunctionCallScalarExpression.CreateBuiltin("STRINGEQUALS", left, right, caseInsensitive);
}

return null;
}

Expand All @@ -263,12 +324,7 @@ static StringBuiltinFunctions()
},
{
"EndsWith",
new SqlBuiltinFunctionVisitor("ENDSWITH",
false,
new List<Type[]>
{
new Type[]{typeof(string)}
})
new SqlStringWithComparisonVisitor("ENDSWITH")
},
{
"IndexOf",
Expand Down Expand Up @@ -319,12 +375,7 @@ static StringBuiltinFunctions()
},
{
"StartsWith",
new SqlBuiltinFunctionVisitor("STARTSWITH",
false,
new List<Type[]>
{
new Type[]{typeof(string)}
})
new SqlStringWithComparisonVisitor("STARTSWITH")
},
{
"Substring",
Expand Down
17 changes: 14 additions & 3 deletions ...ulatorTests/BaselineTest/TestBaseline/LinqTranslationBaselineTests.TestSpecialMethods.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,18 @@
<Output>
<SqlQuery><![CDATA[
SELECT VALUE (root["StringField"] = "str")
FROM root ]]></SqlQuery>
FROM root]]></SqlQuery>
</Output>
</Result>
<Result>
<Input>
<Description><![CDATA[Equals (case-insensitive)]]></Description>
<Expression><![CDATA[query.Select(doc => doc.StringField.Equals("STR", OrdinalIgnoreCase))]]></Expression>
</Input>
<Output>
<SqlQuery><![CDATA[
SELECT VALUE STRINGEQUALS(root["StringField"], "STR", true)
FROM root]]></SqlQuery>
</Output>
</Result>
<Result>
Expand All @@ -18,7 +29,7 @@ FROM root ]]></SqlQuery>
<Output>
<SqlQuery><![CDATA[
SELECT VALUE root["StringField"]
FROM root ]]></SqlQuery>
FROM root]]></SqlQuery>
</Output>
</Result>
<Result>
Expand All @@ -29,7 +40,7 @@ FROM root ]]></SqlQuery>
<Output>
<SqlQuery><![CDATA[
SELECT VALUE root["EnumerableField"][0]
FROM root ]]></SqlQuery>
FROM root]]></SqlQuery>
</Output>
</Result>
</Results>
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