LiaCastaneda commented on code in PR #16454:
URL: https://github.com/apache/datafusion/pull/16454#discussion_r2179767364
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datafusion/substrait/tests/testdata/test_plans/join_with_expression_key.json:
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Review Comment:
Sorry for the huge substrait plan, here is the SQL version:
```
WITH index_sizes
AS (SELECT index_name AS index,
Upper(host) AS host_expr,
Max(size_bytes) AS idx_size
FROM index_metrics
WHERE index_name IN ( 'aaa' )
GROUP BY index_name,
Upper(host)),
db_sizes
AS (SELECT Upper(host) AS host_expr,-- scalar func
Max(total_bytes) AS db_size
FROM db_metrics
WHERE Upper(host) IN (SELECT host_expr
FROM index_sizes) -- semi-join
GROUP BY Upper(host))
SELECT ix.index,
ds.host_expr AS host,
ix.idx_size,
ds.db_size,
( ix.idx_size / ds.db_size ) * 100.0 AS pct_of_db
FROM index_sizes ix
JOIN db_sizes ds
ON ix.host_expr = ds.host_expr;
```
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