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Query: Introduce QuerySqlGenerator.GenerateRootCommand as interception point to capture top-level query expression #28582

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Aug 5, 2022
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Query: Introduce QuerySqlGenerator.GenerateRootCommand as interception point to capture top-level query expression #28582

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14 changes: 12 additions & 2 deletions src/EFCore.Relational/Query/QuerySqlGenerator.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -68,6 +68,18 @@ public virtual IRelationalCommand GetCommand(Expression queryExpression)
{
_relationalCommandBuilder = _relationalCommandBuilderFactory.Create();

GenerateRootCommand(queryExpression);

return _relationalCommandBuilder.Build();
}

/// <summary>
/// Generates the command for the given top-level query expression. This allows providers to intercept if an expression
/// requires different processing when it is at top-level.
/// </summary>
/// <param name="queryExpression">A query expression to print in command.</param>
protected virtual void GenerateRootCommand(Expression queryExpression)
{
switch (queryExpression)
{
case SelectExpression selectExpression:
Expand All @@ -90,8 +102,6 @@ public virtual IRelationalCommand GetCommand(Expression queryExpression)
default:
throw new InvalidOperationException();
}

return _relationalCommandBuilder.Build();
}

/// <summary>
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