issue_comments: 813162622
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html_url | issue_url | id | node_id | user | created_at | updated_at | author_association | body | reactions | issue | performed_via_github_app |
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https://github.com/simonw/datasette/issues/1293#issuecomment-813162622 | https://api.github.com/repos/simonw/datasette/issues/1293 | 813162622 | MDEyOklzc3VlQ29tbWVudDgxMzE2MjYyMg== | 9599 | 2021-04-05T03:34:24Z | 2021-04-05T03:40:35Z | OWNER | This almost works, but throws errors with some queries (anything with a `rowid` column for example) - it needs a bunch of test coverage. ```python def columns_for_query(conn, sql): rows = conn.execute('explain ' + sql).fetchall() table_rootpage_by_register = {r['p1']: r['p2'] for r in rows if r['opcode'] == 'OpenRead'} names_by_rootpage = dict( conn.execute( 'select rootpage, name from sqlite_master where rootpage in ({})'.format( ', '.join(map(str, table_rootpage_by_register.values())) ) ) ) columns_by_column_register = {} for row in rows: if row['opcode'] == 'Column': addr, opcode, table_id, cid, column_register, p4, p5, comment = row table = names_by_rootpage[table_rootpage_by_register[table_id]] columns_by_column_register[column_register] = (table, cid) result_row = [dict(r) for r in rows if r['opcode'] == 'ResultRow'][0] registers = list(range(result_row["p1"], result_row["p1"] + result_row["p2"] - 1)) all_column_names = {} for table in names_by_rootpage.values(): table_xinfo = conn.execute('pragma table_xinfo({})'.format(table)).fetchall() for row in table_xinfo: all_column_names[(table, row["cid"])] = row["name"] final_output = [] for r in registers: try: table, cid = columns_by_column_register[r] final_output.append((table, all_column_names[table, cid])) except KeyError: final_output.append((None, None)) return final_output ``` | {"total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | 849978964 |