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Engine File(CSVWithNames) inserts more headers than needed #6155

@4ertus2

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@4ertus2

Engine File(CSVWithNames) inserts redundant headers, so second insert makes file unreadable by selects.

CREATE TABLE tmp (n UInt32, s String) ENGINE = Memory;
CREATE TABLE table_csv AS tmp ENGINE = File(CSVWithNames);

INSERT INTO table_csv SELECT number as n, toString(n) as s FROM numbers(10);
INSERT INTO table_csv SELECT number as n, toString(n) as s FROM numbers(10);

SELECT * FROM table_csv;
Code: 27. DB::Exception: Received from localhost:9000. DB::Exception: Cannot parse input: expected " before: n","s"\n0,"0"\n1,"1"\n2,"2"\n3,"3"\n4,"4"\n5,"5"\n6,"6"\n7,"7"\n8,"8"\n9,"9"\n: (at row 11)

Row 10:
Column 0,   name: n, type: UInt32, parsed text: "9"
Column 1,   name: s, type: String, parsed text: "<DOUBLE QUOTE>9<DOUBLE QUOTE>"

Row 11:
Column 0,   name: n, type: UInt32, ERROR: text "<DOUBLE QUOTE>n<DOUBLE QUOTE>,<DOUBLE QUOTE>s<DOUBLE QUOTE><LINE FEED>0," is not like UInt32

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bugConfirmed user-visible misbehaviour in official releasecomp-formatsInput/output formats (CSV/JSON/Parquet/ORC/Arrow/Protobuf/etc.).st-acceptedThe issue is in our backlog, ready to take

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