ClickHouse/clickhouse-cs

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• TCP Dynamic: insert of an object[], nullable-element or System.Tuple composite fails with InvalidCastException instead of NotSupportedException

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  bug

  Difficulty 3/5 1-2 days Newbie friendliness 64/100

  ClickHouse/clickhouse-cs#652 · Opened Oct 1, 2026

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• Dynamic: a collection that contains itself crashes the process with a stack overflow

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  bug

  Difficulty 4/5 3-5 days Newbie friendliness 45/100

  ClickHouse/clickhouse-cs#651 · Opened Oct 1, 2026

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• ClickHouseDecimal: division throws "Scale cannot be <0" when the quotient has more than 50 integer digits

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  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 88/100

  ClickHouse/clickhouse-cs#650 · Opened Oct 1, 2026

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• ClickHouseDecimal: Floor() rounds negative non-integers toward zero (-1.5 → -1, server floor gives -2)

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  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 88/100

  ClickHouse/clickhouse-cs#645 · Opened Oct 1, 2026

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• ClickHouseDecimal: GetHashCode depends on Scale, but Equals ignores Scale

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  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 88/100

  ClickHouse/clickhouse-cs#639 · Opened Oct 1, 2026

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• Query parameters: ClickHouseDecimal values are inferred as Decimal128(9), so scale > 9 is silently truncated

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  bug

  Difficulty 4/5 3-5 days Newbie friendliness 68/100

  ClickHouse/clickhouse-cs#637 · Opened Oct 1, 2026

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• JSON: a typed path wrapped in SimpleAggregateFunction is never unwrapped — composite values throw "The element cannot be an object or array", Array(UInt8) reads as base64

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  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 88/100

  ClickHouse/clickhouse-cs#627 · Opened Sep 25, 2026

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• InsertBinaryAsync attaches the caller's InsertOptions.QueryId to the internal schema-probe SELECT instead of the INSERT

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  Difficulty 3/5 1-2 days Newbie friendliness 65/100

  ClickHouse/clickhouse-cs#624 · Opened Sep 24, 2026

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• Binary write: Date/Date32/DateTime/DateTime64 reject string values with a bare NotSupportedException, unlike every other scalar type

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  Difficulty 3/5 1-2 days Newbie friendliness 78/100

  ClickHouse/clickhouse-cs#614 · Opened Sep 14, 2026

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• InsertBinaryAsync / InsertRawStreamAsync concatenate the raw table name into SQL — names needing backquotes cannot be used

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  Difficulty 4/5 3-5 days Newbie friendliness 58/100

  ClickHouse/clickhouse-cs#602 · Opened Aug 31, 2026

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• ClickHouseDataReader silently returns zero rows when every column is zero-width (Tuple())

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  bug

  Difficulty 4/5 3-5 days Newbie friendliness 45/100

  ClickHouse/clickhouse-cs#570 · Opened Aug 18, 2026

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• Types: Object('json') column is parsed as SimpleAggregateFunction, so GetSchema("Columns") reports "SimpleAggregateFunction(, Json)"

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  bug

  Difficulty 1/5 Under an hour Newbie friendliness 85/100

  ClickHouse/clickhouse-cs#545 · Opened Aug 12, 2026

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• Types: named Tuple/Map element of type JSON is unreadable — "Unknown type: x JSON"

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  bug

  Difficulty 3/5 1-2 days Newbie friendliness 72/100

  ClickHouse/clickhouse-cs#543 · Opened Aug 12, 2026

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• JSON: reading a Dynamic/Variant-hinted path that holds an array throws InvalidOperationException; string values under a Dynamic hint are base64 under ReadStringsAsByteArrays

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  bug

  Difficulty 3/5 1-2 days Newbie friendliness 68/100

  ClickHouse/clickhouse-cs#530 · Opened Aug 6, 2026

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• CustomHeaders: any HTTP content header throws InvalidOperationException ("Misused header name") instead of being applied or ignored

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  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 78/100

  ClickHouse/clickhouse-cs#528 · Opened Aug 6, 2026

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• ClickHouseCommand: CommandBehavior matched by equality, so SchemaOnly/SingleRow combined with any other flag applies no row limit

  May be free again @polyglotAI-bot claimed this 59 days ago, and no pull request is open. Open

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  bug

  ClickHouse/clickhouse-cs#520 · 1 assignee · Opened Aug 5, 2026

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• GetDateTimeOffset() and GetSchemaTable() ignore LowCardinality/SimpleAggregateFunction wrappers: GetEffectiveClickHouseType only unwraps Nullable

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  bug

  Difficulty 3/5 1-2 days Newbie friendliness 78/100

  ClickHouse/clickhouse-cs#518 · Opened Aug 4, 2026

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• GetDateTimeOffset returns the wrong instant for DST-ambiguous timestamps: it coerces from a wall-clock DateTime instead of reading the stored instant

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  bug triage:bugfix

  Difficulty 3/5 1-2 days Newbie friendliness 78/100

  ClickHouse/clickhouse-cs#515 · Opened Aug 4, 2026

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• ReadStringsAsByteArrays breaks GetSchema("Columns") and GetString()

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  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  ClickHouse/clickhouse-cs#486 · Opened Jul 31, 2026

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• ExecuteRawResultAsync / ClickHouseRawResult does not detect in-band mid-stream server exceptions

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  Difficulty 3/5 1-2 days Newbie friendliness 74/100

  ClickHouse/clickhouse-cs#475 · Opened Jul 30, 2026

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• Query parameters sent in URI by default cause HTTP 414 with large IN-lists / vector embeddings

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  Difficulty 4/5 3-5 days Newbie friendliness 45/100

  ClickHouse/clickhouse-cs#334 · Opened May 15, 2026

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• ExecuteNonQueryAsync silently treats HTTP 200 with mid-stream exception as success

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  Difficulty 3/5 1-2 days Newbie friendliness 72/100

  ClickHouse/clickhouse-cs#333 · Opened May 15, 2026

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• The Dilemma of Using InsertBinaryAsync

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  Difficulty 5/5 Over a week Newbie friendliness 38/100

  ClickHouse/clickhouse-cs#328 · Opened May 12, 2026

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• EncloseColumnName / QuoteSingle / QuoteDouble skip escaping when input starts and ends with the quote char

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  Difficulty 2/5 1-3 hours Newbie friendliness 78/100

  ClickHouse/clickhouse-cs#316 · Opened May 8, 2026

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• Use per-TFM package versions instead of pinning to latest net10 version

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  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  ClickHouse/clickhouse-cs#313 · 1 reaction · Opened May 1, 2026

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• Expose HTTP response message (or response metadata) for ClickHouseRawResult

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  enhancement

  Difficulty 3/5 1-2 days Newbie friendliness 45/100

  ClickHouse/clickhouse-cs#198 · Opened Jan 28, 2026

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• External Data

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  Difficulty 5/5 Over a week Newbie friendliness 25/100

  ClickHouse/clickhouse-cs#67 · 1 comment · Opened Nov 12, 2025

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• Update external dependencies

  May be free again @alex-clickhouse claimed this 353 days ago, and no pull request is open. Open

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  ClickHouse/clickhouse-cs#12 · 2 comments · 2 reactions · 1 assignee · Opened Aug 11, 2025

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• ClickHouseDecimal: Convert.ToInt32 keeps only 16 bits (wrong Int32 inserts), and Convert.ChangeType to an unsupported type overflows the stack

  Possibly taken @polyglotAI-bot claimed this 4 days ago. Open

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  bug

  ClickHouse/clickhouse-cs#646 · 1 assignee · Opened Oct 1, 2026

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• Dynamic: writing a plain System.Object value recurses forever and crashes the process with a stack overflow

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  bug

  ClickHouse/clickhouse-cs#644 · 1 assignee · Opened Oct 1, 2026

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• ClickHouseDecimal: NumberOfDigits is one too low at powers of ten, so Truncate() and Convert.ChangeType(..., typeof(BigInteger)) return wrong values

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  bug

  Difficulty 3/5 1-2 days Newbie friendliness 74/100

  ClickHouse/clickhouse-cs#642 · 1 comment · Opened Oct 1, 2026

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• docs: http.mdx says writing Dynamic throws NotImplementedException, but binary inserts into Dynamic work

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  bug documentation

  Difficulty 1/5 Under an hour Newbie friendliness 92/100

  ClickHouse/clickhouse-cs#638 · Opened Oct 1, 2026

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• Dynamic: preserve decimal collection precision during binary inserts

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  bug

  ClickHouse/clickhouse-cs#636 · 1 assignee · Opened Oct 1, 2026

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• JSON: a path holding a Tuple (heterogeneous JSON array) throws "The element cannot be an object or array"; Dynamic(max_types=N) is an unknown type

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  Difficulty 3/5 1-2 days Newbie friendliness 76/100

  ClickHouse/clickhouse-cs#626 · Opened Sep 25, 2026

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• ClickHouseRawResult.ReadAsStringAsync (and friends) should support cancellation

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  enhancement

  Difficulty 3/5 1-2 days Newbie friendliness 68/100

  ClickHouse/clickhouse-cs#546 · Opened Aug 13, 2026

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• Reading SimpleAggregateFunction inside a Dynamic column throws NotImplementedException

  Possibly taken @polyglotAI-bot claimed this 63 days ago. Open

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  Difficulty 2/5 1-3 hours Newbie friendliness 88/100

  ClickHouse/clickhouse-cs#505 · Opened Aug 3, 2026

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• Unable to rotate password without overriding internal HTTP infrastructure

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  Difficulty 5/5 Over a week Newbie friendliness 45/100

  ClickHouse/clickhouse-cs#395 · 2 reactions · Opened Jul 6, 2026

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