ClickHouse/tests/queries/0_stateless/01670_neighbor_lc_bug.sql

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SELECT
neighbor(n, -2) AS int,
neighbor(s, -2) AS str,
neighbor(lcs, -2) AS lowCstr
FROM
(
SELECT
number % 5 AS n,
toString(n) AS s,
CAST(s, 'LowCardinality(String)') AS lcs
FROM numbers(10)
);
drop table if exists neighbor_test;
CREATE TABLE neighbor_test
(
`rowNr` UInt8,
`val_string` String,
`val_low` LowCardinality(String)
)
ENGINE = MergeTree
PARTITION BY tuple()
ORDER BY rowNr;
INSERT INTO neighbor_test VALUES (1, 'String 1', 'String 1'), (2, 'String 1', 'String 1'), (3, 'String 2', 'String 2');
SELECT
rowNr,
val_string,
neighbor(val_string, -1) AS str_m1,
neighbor(val_string, 1) AS str_p1,
val_low,
neighbor(val_low, -1) AS low_m1,
neighbor(val_low, 1) AS low_p1
FROM
(
SELECT *
FROM neighbor_test
ORDER BY val_string ASC
) format PrettyCompact;
drop table if exists neighbor_test;