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analyzer: correctly search for subquery used columns #573

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Dec 13, 2018
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analyzer: correctly search for subquery used columns #573

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2 changes: 1 addition & 1 deletion sql/analyzer/prune_columns.go
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Original file line number Diff line number Diff line change
Expand Up @@ -79,7 +79,7 @@ func pruneSubqueryColumns(
columns[table][col] = struct{}{}
}

findUsedColumns(columns, n)
findUsedColumns(columns, n.Child)

node, err := addSubqueryBarriers(n.Child)
if err != nil {
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64 changes: 64 additions & 0 deletions sql/analyzer/prune_columns_test.go
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Expand Up @@ -206,6 +206,70 @@ func TestPruneColumns(t *testing.T) {
),
),
},

{
"used inside subquery and not outside",
plan.NewProject(
[]sql.Expression{
gf(0, "sq", "foo"),
},
plan.NewSubqueryAlias("sq",
plan.NewProject(
[]sql.Expression{gf(0, "t1", "foo")},
plan.NewInnerJoin(
plan.NewProject(
[]sql.Expression{
gf(0, "t1", "foo"),
gf(1, "t1", "bar"),
gf(2, "t1", "bax"),
},
t1,
),
plan.NewProject(
[]sql.Expression{
gf(0, "t2", "foo"),
gf(1, "t2", "baz"),
gf(2, "t2", "bux"),
},
t2,
),
expression.NewEquals(
gf(0, "t1", "foo"),
gf(3, "t2", "foo"),
),
),
),
),
),
plan.NewProject(
[]sql.Expression{
gf(0, "sq", "foo"),
},
plan.NewSubqueryAlias("sq",
plan.NewProject(
[]sql.Expression{gf(0, "t1", "foo")},
plan.NewInnerJoin(
plan.NewProject(
[]sql.Expression{
gf(0, "t1", "foo"),
},
t1,
),
plan.NewProject(
[]sql.Expression{
gf(0, "t2", "foo"),
},
t2,
),
expression.NewEquals(
gf(0, "t1", "foo"),
gf(3, "t2", "foo"),
),
),
),
),
),
},
}

for _, tt := range testCases {
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