test: Add case for #1990

Author: kyleconroy

internal/endtoend/testdata/select_subquery_alias/issue.md

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+https://github.com/sqlc-dev/sqlc/issues/1990

internal/endtoend/testdata/select_subquery_alias/postgresql/pgx/exec.json

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+{
+  "contexts": ["managed-db"]
+}

internal/endtoend/testdata/select_subquery_alias/postgresql/pgx/go/db.go

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+-- name: FindWallets :many
+select id, address, balance, total_balance from 
+(
+	select id, address, balance,
+	  sum(balance) over (order by balance desc rows between unbounded preceding and current row) as total_balance,
+	  sum(balance) over (order by balance desc rows between unbounded preceding and current row) - balance as last_balance
+	from wallets
+	where type=$1
+) amounts
+where amounts.last_balance < $2;

internal/endtoend/testdata/select_subquery_alias/postgresql/pgx/go/models.go

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+CREATE TABLE IF NOT EXISTS wallets
+(
+    id BIGSERIAL PRIMARY KEY,
+    address VARCHAR(44) NOT NULL,
+    type VARCHAR(44) NOT NULL,
+    balance DECIMAL(32, 18) NULL
+);

internal/endtoend/testdata/select_subquery_alias/postgresql/pgx/go/query.sql.go

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+version: "2"
+sql:
+  - engine: "postgresql"
+    schema: "schema.sql"
+    queries: "query.sql"
+    gen:
+      go:
+        package: "querytest"
+        out: "go"
+        sql_package: "pgx/v5"