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satellite/metabase: fix GetStreamPieceCountByNodeID full table scan

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Previous version of SQL query was causing full table scan.

Output of EXPLAIN:
---
distribution: local
vectorized: true

• lookup join
│ table: segments@segments_pkey
│ equality: (?column?) = (stream_id)
│ pred: remote_alias_pieces IS NOT NULL
│
└── • union
    │
    ├── • values
    │     size: 1 column, 1 row
    │
    └── • scan
          missing stats
          table: segment_copies@segment_copies_pkey
          spans: [/'\xff135285155378d980b8c49148cef3ca' - /'\xff135285155378d980b8c49148cef3ca']
---

Change-Id: I708d1df204ac2d33cefe80b23594442b193424d2
This commit is contained in:
Michal Niewrzal 2023-01-11 00:24:19 +01:00
parent 5fdfc6c4f3
commit 282aaf8945
1 changed files with 1 additions and 5 deletions
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6
satellite/metabase/streamstat.go
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@ -31,11 +31,7 @@ func (db *DB) GetStreamPieceCountByNodeID(ctx context.Context, opts GetStreamPie
err = withRows(db.db.QueryContext(ctx, ` err = withRows(db.db.QueryContext(ctx, `
SELECT remote_alias_pieces SELECT remote_alias_pieces
FROM segments FROM segments
WHERE stream_id = $1 AND remote_alias_pieces IS NOT null WHERE stream_id IN (SELECT $1 UNION SELECT ancestor_stream_id FROM segment_copies WHERE stream_id = $1) AND remote_alias_pieces IS NOT null
UNION
SELECT remote_alias_pieces
FROM segments
WHERE stream_id = (SELECT ancestor_stream_id FROM segment_copies WHERE stream_id = $1) AND remote_alias_pieces IS NOT null
`, opts.StreamID))(func(rows tagsql.Rows) error { `, opts.StreamID))(func(rows tagsql.Rows) error {
for rows.Next() { for rows.Next() {
var aliasPieces AliasPieces var aliasPieces AliasPieces