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49 lines
1.5 KiB
SQL
49 lines
1.5 KiB
SQL
-- Tags: shard
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SET allow_experimental_analyzer = 1;
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DROP TABLE IF EXISTS test_table;
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CREATE TABLE test_table
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(
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id String,
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parent_id String
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)
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ENGINE = MergeTree ORDER BY id;
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INSERT INTO test_table VALUES ('a', '');
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INSERT INTO test_table VALUES ('b', 'a');
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INSERT INTO test_table VALUES ('c', 'a');
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WITH RECURSIVE search_tree AS (
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SELECT id, parent_id, [parent_id] AS path, toUInt64(0) AS depth
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FROM test_table
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UNION ALL
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SELECT t.id, t.parent_id, arrayConcat(path, [t.id]) as path, depth + 1
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FROM test_table t, search_tree st
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WHERE t.parent_id = st.id)
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SELECT * FROM search_tree ORDER BY depth, id, parent_id;
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SELECT '--';
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WITH RECURSIVE search_tree AS (
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SELECT id, parent_id, [parent_id] AS path, toUInt64(0) AS depth
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FROM remote('127.0.0.1', currentDatabase(), test_table)
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UNION ALL
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SELECT t.id, t.parent_id, arrayConcat(path, [t.id]) as path, depth + 1
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FROM remote('127.0.0.1', currentDatabase(), test_table) t, search_tree st
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WHERE t.parent_id = st.id)
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SELECT * FROM search_tree ORDER BY depth, id, parent_id;
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SELECT '--';
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WITH RECURSIVE search_tree AS (
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SELECT id, parent_id, [parent_id] AS path, toUInt64(0) AS depth
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FROM remote('127.0.0.{1,2}', currentDatabase(), test_table)
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UNION ALL
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SELECT t.id, t.parent_id, arrayConcat(path, [t.id]) as path, depth + 1
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FROM remote('127.0.0.{1,2}', currentDatabase(), test_table) t, search_tree st
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WHERE t.parent_id = st.id)
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SELECT * FROM search_tree ORDER BY depth, id, parent_id;;
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DROP TABLE test_table;
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