[jira] [Created] (CALCITE-4206) RelDecorrelator outputs wong plan for correlate sort with fetch limit

["Danny Chen (Jira)" <ji...@apache.org>]

Danny Chen created CALCITE-4206:
-----------------------------------

             Summary: RelDecorrelator outputs wong plan for correlate sort with fetch limit
                 Key: CALCITE-4206
                 URL: https://issues.apache.org/jira/browse/CALCITE-4206
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.25.0
            Reporter: Danny Chen
            Assignee: Danny Chen
             Fix For: 1.26.0


For query

{code:sql}
-- create cities table
CREATE TABLE cities (
  name STRING NOT NULL,
  state STRING NOT NULL,
  pop INT NOT NULL
) WITH (
  'connector' = 'kafka',
  'topic' = 'cities',
  'properties.bootstrap.servers' = 'kafka:9092',
  'properties.group.id' = 'mygroup', 
  'scan.startup.mode' = 'earliest-offset',
  'format' = 'json'
);

-- fill cities table
INSERT INTO cities VALUES
  ('Los_Angeles', 'CA', 3979576),
  ('Phoenix', 'AZ', 1680992),
  ('Houston', 'TX', 2320268),
  ('San_Diego', 'CA', 1423851),
  ('San_Francisco', 'CA', 881549),
  ('New_York', 'NY', 8336817),
  ('Dallas', 'TX', 1343573),
  ('San_Antonio', 'TX', 1547253),
  ('San_Jose', 'CA', 1021795),
  ('Chicago', 'IL', 2695598),
  ('Austin', 'TX', 978908);

-- execute query
SELECT state, name 
FROM
  (SELECT DISTINCT state FROM cities) states,
  LATERAL (
    SELECT name, pop
    FROM cities
    WHERE state = states.state
    ORDER BY pop
    DESC LIMIT 3
  );

-- result
state                      name
   CA               Los_Angeles
   NY                  New_York
   IL                   Chicago

-- expected result
state | name
------+-------------
TX    | Dallas
AZ    | Phoenix
IL    | Chicago
TX    | Houston
CA    | San_Jose
NY    | New_York
CA    | San_Diego
CA    | Los_Angeles
TX    | San_Antonio
{code}

The current plan after decorrelation is

{code:xml}
//
{code}




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