protected override IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
{
var sequence = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]));
var collectionSelector = (LambdaExpression)methodCall.Arguments[1].Unwrap();
var resultSelector = (LambdaExpression)methodCall.Arguments[2].Unwrap();
var expr = collectionSelector.Body.Unwrap();
DefaultIfEmptyBuilder.DefaultIfEmptyContext?defaultIfEmpty = null;
if (expr is MethodCallExpression mc && AllJoinsBuilder.IsMatchingMethod(mc, true))
{
defaultIfEmpty = new DefaultIfEmptyBuilder.DefaultIfEmptyContext(buildInfo.Parent, sequence, null);
sequence = new SubQueryContext(defaultIfEmpty);
defaultIfEmpty.Disabled = true;
}
protected override IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
{
var sequence = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]));
var collectionSelector = (LambdaExpression)methodCall.Arguments[1].Unwrap();
var resultSelector = (LambdaExpression)methodCall.Arguments[2].Unwrap();
if (sequence.SelectQuery.HasUnion || !sequence.SelectQuery.IsSimple)
{
sequence = new SubQueryContext(sequence);
}
var expr = collectionSelector.Body.Unwrap();
DefaultIfEmptyBuilder.DefaultIfEmptyContext defaultIfEmpty = null;
if (expr is MethodCallExpression mc && AllJoinsBuilder.IsMatchingMethod(mc, true))
{
defaultIfEmpty = new DefaultIfEmptyBuilder.DefaultIfEmptyContext(buildInfo.Parent, sequence, null);
defaultIfEmpty.Disabled = true;
sequence = new SubQueryContext(defaultIfEmpty);
}
var context = new SelectManyContext(buildInfo.Parent, collectionSelector, sequence);
context.SetAlias(collectionSelector.Parameters[0].Name);
var collectionInfo = new BuildInfo(context, expr, new SelectQuery());
var collection = builder.BuildSequence(collectionInfo);
if (resultSelector.Parameters.Count > 1)
{
collection.SetAlias(resultSelector.Parameters[1].Name);
}
if (defaultIfEmpty != null && (collectionInfo.JoinType == JoinType.Right || collectionInfo.JoinType == JoinType.Full))
{
defaultIfEmpty.Disabled = false;
}
var leftJoin = collection is DefaultIfEmptyBuilder.DefaultIfEmptyContext || collectionInfo.JoinType == JoinType.Left;
var sql = collection.SelectQuery;
var sequenceTables = new HashSet <ISqlTableSource>(sequence.SelectQuery.From.Tables[0].GetTables());
var newQuery = null != QueryVisitor.Find(sql, e => e == collectionInfo.SelectQuery);
var crossApply = null != QueryVisitor.Find(sql, e =>
e.ElementType == QueryElementType.TableSource && sequenceTables.Contains((ISqlTableSource)e) ||
e.ElementType == QueryElementType.SqlField && sequenceTables.Contains(((SqlField)e).Table) ||
e.ElementType == QueryElementType.Column && sequenceTables.Contains(((SqlColumn)e).Parent));
if (collection is JoinBuilder.GroupJoinSubQueryContext queryContext)
{
var groupJoin = queryContext.GroupJoin;
groupJoin.SelectQuery.From.Tables[0].Joins[0].JoinType = JoinType.Inner;
groupJoin.SelectQuery.From.Tables[0].Joins[0].IsWeak = false;
}
if (!newQuery)
{
if (collection.SelectQuery.Select.HasModifier)
{
if (crossApply)
{
var foundJoin = context.SelectQuery.FindJoin(j => j.Table.Source == collection.SelectQuery);
if (foundJoin != null)
{
foundJoin.JoinType = leftJoin ? JoinType.OuterApply : JoinType.CrossApply;
collection.SelectQuery.Where.ConcatSearchCondition(foundJoin.Condition);
((ISqlExpressionWalkable)collection.SelectQuery.Where).Walk(new WalkOptions(), e =>
{
if (e is SqlColumn column)
{
if (column.Parent == collection.SelectQuery)
{
return(column.UnderlyingColumn);
}
}
return(e);
});
foundJoin.Condition.Conditions.Clear();
}
}
}
context.Collection = new SubQueryContext(collection, sequence.SelectQuery, false);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
if (!crossApply)
{
if (!leftJoin)
{
context.Collection = new SubQueryContext(collection, sequence.SelectQuery, true);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
else
{
var join = sql.OuterApply();
sequence.SelectQuery.From.Tables[0].Joins.Add(join.JoinedTable);
context.Collection = new SubQueryContext(collection, sequence.SelectQuery, false);
return(new SelectContext(buildInfo.Parent, resultSelector, sequence, context));
}
}
void MoveSearchConditionsToJoin(SqlFromClause.Join join)
{
var tableSources = new HashSet <ISqlTableSource>();
((ISqlExpressionWalkable)sql.Where.SearchCondition).Walk(new WalkOptions(), e =>
{
if (e is ISqlTableSource ts && !tableSources.Contains(ts))
{
tableSources.Add(ts);
}
return(e);
});
bool ContainsTable(ISqlTableSource tbl, IQueryElement qe)
{
return(null != QueryVisitor.Find(qe, e =>
e == tbl ||
e.ElementType == QueryElementType.SqlField && tbl == ((SqlField)e).Table ||
e.ElementType == QueryElementType.Column && tbl == ((SqlColumn)e).Parent));
}
var conditions = sql.Where.SearchCondition.Conditions;
if (conditions.Count > 0)
{
for (var i = conditions.Count - 1; i >= 0; i--)
{
var condition = conditions[i];
if (!tableSources.Any(ts => ContainsTable(ts, condition)))
{
join.JoinedTable.Condition.Conditions.Insert(0, condition);
conditions.RemoveAt(i);
}
}
}
}