Rename all IVF shadow tables in vec0Rename

vec0Rename only emitted ALTER TABLE on `<name>_ivf_cells%02d`, so renaming
an IVF-indexed vec0 table left `_ivf_centroids`, `_ivf_rowid_map`, and
`_ivf_vectors` (when quantizer != none) with the old prefix. Subsequent
queries against the renamed table broke, and DROP TABLE left those three
shadows orphaned in the schema. Same shape as the DiskANN/rescore bug fixed
in #294, just for the IVF branch.

Mirror ivf_create_shadow_tables: emit ALTER for all four IVF shadows,
gating `_ivf_vectors` on quantizer != VEC0_IVF_QUANTIZER_NONE.

Adds test-ivf-rename.py (auto-skipped on default builds via conftest's
test-ivf prefix rule) covering quantizer=none, quantizer=binary, and
DROP-after-rename. Also adds a rescore rename regression test to
test-rename.py to lock down the (already-correct) rescore path.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

sqlite-vec.c

@@ -10472,9 +10472,22 @@ static int vec0Rename(sqlite3_vtab *pVtab, const char *zNew) {
 #if SQLITE_VEC_EXPERIMENTAL_IVF_ENABLE
   for (int i = 0; i < p->numVectorColumns; i++) {
     if (p->shadowIvfCellsNames[i]) {
+      sqlite3_str_appendf(s,
+        "ALTER TABLE \"%w\".\"%w_ivf_centroids%02d\" RENAME TO \"%w_ivf_centroids%02d\";",
+        p->schemaName, p->tableName, i, zNew, i);
       sqlite3_str_appendf(s,
         "ALTER TABLE \"%w\".\"%w_ivf_cells%02d\" RENAME TO \"%w_ivf_cells%02d\";",
         p->schemaName, p->tableName, i, zNew, i);
+      sqlite3_str_appendf(s,
+        "ALTER TABLE \"%w\".\"%w_ivf_rowid_map%02d\" RENAME TO \"%w_ivf_rowid_map%02d\";",
+        p->schemaName, p->tableName, i, zNew, i);
+      // _ivf_vectors is only created when quantizer != none
+      // (mirror ivf_create_shadow_tables in sqlite-vec-ivf.c).
+      if (p->vector_columns[i].ivf.quantizer != VEC0_IVF_QUANTIZER_NONE) {
+        sqlite3_str_appendf(s,
+          "ALTER TABLE \"%w\".\"%w_ivf_vectors%02d\" RENAME TO \"%w_ivf_vectors%02d\";",
+          p->schemaName, p->tableName, i, zNew, i);
+      }
     }
   }
 #endif

tests/test-ivf-rename.py

@@ -0,0 +1,98 @@
+import sqlite3
+import pytest
+from helpers import _f32
+
+
+def _shadow_tables(db, prefix):
+    """Return sorted list of shadow table names for a given prefix."""
+    return sorted([
+        row[0] for row in db.execute(
+            r"select name from sqlite_master where name like ? escape '\' and type='table' order by 1",
+            [f"{prefix}\\__%"],
+        ).fetchall()
+    ])
+
+
+def test_rename_ivf_no_quantizer(db):
+    """Rename should rename all IVF shadow tables (_ivf_centroids, _ivf_cells,
+    _ivf_rowid_map). quantizer=none — no _ivf_vectors table."""
+    db.execute("""
+        CREATE VIRTUAL TABLE v USING vec0(
+            a float[4] indexed by ivf(nlist=2, quantizer=none)
+        )
+    """)
+    db.execute("insert into v(rowid, a) values (1, ?)", [_f32([0.1] * 4)])
+    db.execute("insert into v(rowid, a) values (2, ?)", [_f32([0.9] * 4)])
+
+    before = _shadow_tables(db, "v")
+    assert "v_ivf_centroids00" in before
+    assert "v_ivf_cells00" in before
+    assert "v_ivf_rowid_map00" in before
+    assert "v_ivf_vectors00" not in before  # quantizer=none -> no _ivf_vectors
+    assert "v_vector_chunks00" not in before
+
+    db.execute("ALTER TABLE v RENAME TO v2")
+
+    # Querying the renamed table should still work — it hits _ivf_cells,
+    # _ivf_centroids (when trained), and _ivf_rowid_map.
+    rows = db.execute(
+        "select rowid from v2 where a match ? and k=10",
+        [_f32([0.1] * 4)],
+    ).fetchall()
+    assert any(r[0] == 1 for r in rows)
+
+    after = _shadow_tables(db, "v2")
+    assert "v2_ivf_centroids00" in after
+    assert "v2_ivf_cells00" in after
+    assert "v2_ivf_rowid_map00" in after
+
+    # No old shadow tables should remain
+    assert _shadow_tables(db, "v") == []
+
+
+def test_rename_ivf_quantizer_binary(db):
+    """Rename should also rename _ivf_vectors when quantizer != none."""
+    db.execute("""
+        CREATE VIRTUAL TABLE v USING vec0(
+            a float[8] indexed by ivf(nlist=2, quantizer=binary)
+        )
+    """)
+    db.execute("insert into v(rowid, a) values (1, ?)", [_f32([0.1] * 8)])
+
+    before = _shadow_tables(db, "v")
+    assert "v_ivf_centroids00" in before
+    assert "v_ivf_cells00" in before
+    assert "v_ivf_rowid_map00" in before
+    assert "v_ivf_vectors00" in before  # quantizer=binary creates _ivf_vectors
+
+    db.execute("ALTER TABLE v RENAME TO v2")
+
+    rows = db.execute(
+        "select rowid from v2 where a match ? and k=10",
+        [_f32([0.1] * 8)],
+    ).fetchall()
+    assert rows[0][0] == 1
+
+    after = _shadow_tables(db, "v2")
+    assert "v2_ivf_centroids00" in after
+    assert "v2_ivf_cells00" in after
+    assert "v2_ivf_rowid_map00" in after
+    assert "v2_ivf_vectors00" in after
+
+    assert _shadow_tables(db, "v") == []
+
+
+def test_rename_ivf_drop_after(db):
+    """DROP TABLE on a renamed IVF table must drop every shadow table — leftover
+    shadows from a half-renamed IVF index would orphan tables in the schema."""
+    db.execute("""
+        CREATE VIRTUAL TABLE v USING vec0(
+            a float[8] indexed by ivf(nlist=2, quantizer=binary)
+        )
+    """)
+    db.execute("insert into v(rowid, a) values (1, ?)", [_f32([0.1] * 8)])
+    db.execute("ALTER TABLE v RENAME TO v2")
+    db.execute("DROP TABLE v2")
+
+    assert _shadow_tables(db, "v") == []
+    assert _shadow_tables(db, "v2") == []

tests/test-rename.py

@@ -191,6 +191,39 @@ def test_rename_diskann(db):
     assert _shadow_tables(db, "v") == []
 
 
+def test_rename_rescore(db):
+    """Rename should work on rescore-indexed tables (no _vector_chunks shadow)."""
+    db.execute("""
+        CREATE VIRTUAL TABLE v USING vec0(
+            a float[8] indexed by rescore(quantizer=bit)
+        )
+    """)
+    db.execute("insert into v(rowid, a) values (1, ?)", [_f32([0.1] * 8)])
+    db.execute("insert into v(rowid, a) values (2, ?)", [_f32([0.9] * 8)])
+
+    # Rescore columns use _rescore_chunks / _rescore_vectors instead of
+    # _vector_chunks; the rename must skip the missing _vector_chunks ALTER
+    # and rename both rescore shadow tables.
+    before = _shadow_tables(db, "v")
+    assert "v_rescore_chunks00" in before
+    assert "v_rescore_vectors00" in before
+    assert "v_vector_chunks00" not in before
+
+    db.execute("ALTER TABLE v RENAME TO v2")
+
+    rows = db.execute(
+        "select rowid from v2 where a match ? and k=10",
+        [_f32([0.1] * 8)],
+    ).fetchall()
+    assert rows[0][0] == 1
+
+    after = _shadow_tables(db, "v2")
+    assert "v2_rescore_chunks00" in after
+    assert "v2_rescore_vectors00" in after
+    assert "v2_vector_chunks00" not in after
+    assert _shadow_tables(db, "v") == []
+
+
 def test_rename_drop_after(db):
     """DROP TABLE should work on a renamed table."""
     db.execute("create virtual table v using vec0(a float[2], chunk_size=8)")