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LATERAL subquery support #4197

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2d7b302
LATERAL subquery support
WillAbides Nov 26, 2025
7666ff1
fix test
WillAbides Nov 27, 2025
b1d6767
move test
WillAbides Nov 28, 2025
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LATERAL subquery support
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@WillAbides
WillAbides committed Nov 26, 2025
commit 2d7b302a85a2da586681dadd514f836360be4ec5
28 changes: 27 additions & 1 deletion internal/compiler/output_columns.go
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Original file line number Diff line number Diff line change
Expand Up @@ -592,7 +592,24 @@ func (c *Compiler) sourceTables(qc *QueryCatalog, node ast.Node) ([]*Table, erro
tables = append(tables, table)

case *ast.RangeSubselect:
cols, err := c.outputColumns(qc, n.Subquery)
lateralQC := qc
if n.Lateral && len(tables) > 0 {
// LATERAL allows the subquery to reference columns from preceding FROM items.
lateralTables := make(map[string]*Table, len(tables))
for _, table := range tables {
if table.Rel != nil && table.Rel.Name != "" {
lateralTables[table.Rel.Name] = table
}
}
lateralQC = &QueryCatalog{
catalog: qc.catalog,
ctes: qc.ctes,
embeds: qc.embeds,
lateralTables: lateralTables,
}
}

cols, err := c.outputColumns(lateralQC, n.Subquery)
if err != nil {
return nil, err
}
Expand Down Expand Up @@ -637,6 +654,15 @@ func (c *Compiler) sourceTables(qc *QueryCatalog, node ast.Node) ([]*Table, erro
return nil, fmt.Errorf("sourceTable: unsupported list item type: %T", n)
}
}

// Add LATERAL outer tables to the tables list.
// LATERAL subqueries can reference these outer tables for column resolution.
if qc != nil {
for _, lateralTable := range qc.lateralTables {
tables = append(tables, lateralTable)
}
}

return tables, nil
}

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2 changes: 2 additions & 0 deletions internal/compiler/query_catalog.go
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Expand Up @@ -12,6 +12,8 @@ type QueryCatalog struct {
catalog *catalog.Catalog
ctes map[string]*Table
embeds rewrite.EmbedSet

lateralTables map[string]*Table
}

func (comp *Compiler) buildQueryCatalog(c *catalog.Catalog, node ast.Node, embeds rewrite.EmbedSet) (*QueryCatalog, error) {
Expand Down
3 changes: 3 additions & 0 deletions internal/endtoend/testdata/lateral_view_column_ref/issue.md
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@@ -0,0 +1,3 @@
https://github.com/sqlc-dev/sqlc/issues/4182

LATERAL subquery column references from outer query fail with "column does not exist".
32 changes: 32 additions & 0 deletions internal/endtoend/testdata/lateral_view_column_ref/postgresql/pgx/go/db.go
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15 changes: 15 additions & 0 deletions internal/endtoend/testdata/lateral_view_column_ref/postgresql/pgx/go/models.go
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68 changes: 68 additions & 0 deletions internal/endtoend/testdata/lateral_view_column_ref/postgresql/pgx/go/query.sql.go
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9 changes: 9 additions & 0 deletions internal/endtoend/testdata/lateral_view_column_ref/postgresql/pgx/query.sql
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@@ -0,0 +1,9 @@
-- name: GetFooLateral :many
SELECT val, result FROM foo_lateral;

-- name: GetFooLateralDirect :many
SELECT f.id, f.val, sub.result
FROM foo f
CROSS JOIN LATERAL (
SELECT f.val || '-direct' AS result
) sub;
13 changes: 13 additions & 0 deletions internal/endtoend/testdata/lateral_view_column_ref/postgresql/pgx/schema.sql
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@@ -0,0 +1,13 @@
CREATE TABLE foo (
id integer PRIMARY KEY,
val text NOT NULL
);

-- Reproduces issue #4182: LATERAL subquery referencing outer column
CREATE VIEW foo_lateral AS
SELECT t.val, sub.result
FROM foo t
CROSS JOIN LATERAL (
SELECT t.val AS result
FROM foo LIMIT 1
) sub;
10 changes: 10 additions & 0 deletions internal/endtoend/testdata/lateral_view_column_ref/postgresql/pgx/sqlc.yaml
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@@ -0,0 +1,10 @@
version: "2"
sql:
- engine: "postgresql"
schema: "schema.sql"
queries: "query.sql"
gen:
go:
package: "querytest"
out: "go"
sql_package: "pgx/v5"
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