DuckDB Blog Article Code Quality Audit Report

Generated: 2026-08-04

Summary

• Total articles scanned: 185
• ✅ Passed: 82
• ❌ Failed: 95
• ⏱️ Timeout: 5 (network/resource operations, could not verify)

Failed Articles (95)

Python Syntax Errors (4)

SQL Parser Errors - Syntax Issues (majority)

Unrecognized Keywords:

• duckdb-145-lts-andium.md:105 - LOAD DATA FROM (not supported in DuckDB)
• duckdb-153-release.md:142 - syntax error at or near “BY”
• duckdb-154-release.md:103 - syntax error at or near “FROM”
• duckdb-connect-uri-ephemeral-attach.md - Multiple CONNECT statements not supported
• duckdb-columns-exclude-replace.md:90 - syntax error at or near “REPLACE”
• duckdb-complete-guide.md:116 - syntax error at or near “AS” (SELECT REPLACE(… AS …) incorrect)
• duckdb-clickstream-performance-tuning.md:36 - syntax error at or near “..” (ellipsis in SQL)
• duckdb-competitive-intelligence-system.md:193 - syntax error at or near “..”
• duckdb-automated-financial-reporting.md:97 - syntax error at or near “.”
• duckdb-ecosystem-trending-may2026.md:151 - syntax error at or near “.”
• duckdb-excel-read-write.md:162 - syntax error at or near “)”
• duckdb-explain-analyze.md:108 - syntax error at or near “BY” (CLUSTER BY)
• duckdb-data-encryption.md:104 - syntax error at or near “$”
• duckdb-data-encryption.md:182 - syntax error at or near “RESULT”
• duckdb-data-normalization-profit-analysis.md:187 - syntax error at or near “)”
• duckdb-ecommerce-competitor-monitoring-service.md:150 - syntax error at or near “EXTENSION” (CREATE EXTENSION)
• duckdb-list-functions-complete-guide.md:149 - syntax error at or near “..”
• duckdb-list-functions-complete-guide.md:598 - syntax error at or near “CROSS”
• duckdb-materialized-view-incremental-refresh.md:42 - syntax error at or near “MATERIALIZED” (CREATE MATERIALIZED VIEW)
• duckdb-merge-etl-dynamic-filters.md:181 - syntax error at or near “LIKE” (SHOW ALL LIKE)
• duckdb-merge-idempotent-etl.md:44 - syntax error at or near “..” ( ellipsis in UPDATE SET)
• duckdb-merge-into-production-guide.md:36 - syntax error at or near “..”
• duckdb-merge-into-production-guide.md:203 - syntax error at or near “batch_size”
• duckdb-millions-data-processing.md:526,540 - syntax error at or near “..”
• duckdb-online-shell.md - Multiple .help, .files, .tables, .timer (SQLite dot commands)
• duckdb-partition-by-complete-guide.md:110,261,286,298 - Various syntax errors
• duckdb-partition-pruning-production-guide.md:231,281 - Various syntax errors
• duckdb-pivot-by-expression.md:105 - Python syntax error (unterminated triple-quoted string)
• duckdb-pivot-long-to-wide.md - Multiple syntax errors (sales_data, ON, monthly_sales)
• duckdb-pivot-unpivot-data-product.md - Multiple syntax errors (ON, SELECT, UNPIVOT)
• duckdb-pre-aggregation-tables.md - (needs verification)
• duckdb-predicate-pushdown-filter-indexes.md:57,101,110,119,194,215,242 - DATE + BIGINT, WHERE CAST, MATERIALIZED VIEW
• duckdb-price-monitor.md:119 - syntax error at or near “GROUP”
• duckdb-production-deployment-guide.md:270,457,473 - CREATE EXTENSION, CREATE MATERIALIZED VIEW, CLUSTER BY
• duckdb-production-enterprise-guide.md:531 - syntax error at or near “CACHE”
• duckdb-production-error-handling.md:33,127 - Parser errors
• duckdb-python-cron-automated-income-report.md:39 - f-string unmatched parenthesis
• duckdb-python-cron-automated-income-report.md:243 - syntax error at or near “SELECT”
• duckdb-python-udf.md - Multiple CREATE FUNCTION ... RETURNS errors
• duckdb-quack-core-extension-guide.md - Multiple syntax errors (!, EXTERNAL, GRANT)
• duckdb-quack-protocol.md:198 - syntax error at or near “duckdb”
• duckdb-qualify-clause.md:216,252,269 - syntax error at or near “..”
• duckdb-read-duckdb-merge.md - Multiple read_duckdb function signature errors
• duckdb-real-time-streaming-guide.md:266,279 - Partial indexes, PARTITION BY
• duckdb-replace-clickhouse-realtime.md:169 - OR REPLACE with ON CONFLICT conflict
• duckdb-smart-weekly-report-automation.md:49 - VALUES lists must all be the same length
• duckdb-stock-screener.md:294 - CREATE MATERIALIZED VIEW not supported
• duckdb-turbovec-vector-integration.md:44 - Python syntax error
• duckdb-unpivot-grouping-sets.md:208,217,226 - GROUP BY GROUPING SETS syntax error
• duckdb-upcoming-v2-roadmap-preview.md:34,51,111 - variant_col, UPDATE SET, ST_Polygon ellipsis
• duckdb-v154-variegata-key-features.md:27,46,163,269 - duckdb CLI, variant_col, print format, max_size
• duckdb-v15-variegata.md:32 - syntax error at or near “-»”
• duckdb-variant-type.md:275 - syntax error at or near “::”
• duckdb-window-functions-business-analytics.md:40,130,212 - GROUP BY, array_extract type mismatch
• duckdb-window-functions-complete.md:32,147 - Chinese characters, SUM over non-existent table
• ducklake-v1-intro.md:103,119,248 - VERSION syntax, CALL syntax, sum() alias
• pg-duckdb-postgres-analytics.md:216 - syntax error at or near “USING” (CREATE TABLE … USING duckdb)

Binder Errors - Function/Parameter Mismatches

Invalid Parameters:

• duckdb-csv-import-complete-guide.md:97 - Invalid named parameter “file_errors” for read_csv
• duckdb-csv-import-complete-guide.md:318 - Invalid named parameter “data” for read_csv_auto
• duckdb-ecommerce-competitor-monitoring-service.md:109 - Invalid named parameter “RETURN_NULL_ON_ERROR”
• duckdb-hive-partition-query.md:65 - Invalid named parameter “autoparse” for read_csv_auto
• duckdb-json-practical-workshop.md:261 - Invalid named parameter “format” for read_csv
• duckdb-partition-by-complete-guide.md - Unrecognized option “ROWS_PER_GROUP” for parquet
• duckdb-partition-pruning-production-guide.md:231 - Unrecognized option “ROWS_PER_GROUP” for parquet
• duckdb-copy-to-export-complete-guide.md:66,78,216 - Unrecognized option “ROWS_PER_GROUP”
• duckdb-copy-to-export-complete-guide.md:97 - Unrecognized option “SECRET_ACCESS_KEY”
• duckdb-v154-variegata-key-features.md:269 - Invalid named parameter “max_size” for read_parquet

Function Signature Mismatches:

• duckdb-cheapest-hardware-benchmark.md:272 - read_csv_auto(VARCHAR, VARCHAR, VARCHAR)
• duckdb-group-by-aggregation.md:335 - year(VARCHAR) - needs DATE/TIMESTAMP
• duckdb-list-functions-complete-guide.md:621 - list_sort([1, ‘a’, 2]) type mismatch
• duckdb-list-functions-nested-json.md:205 - list_aggr(INTEGER, STRING_LITERAL)
• duckdb-predicate-pushdown-filter-indexes.md:57 - DATE + BIGINT not supported
• duckdb-read-duckdb-merge.md - Multiple read_duckdb(VARCHAR, VARCHAR) signature errors
• duckdb-window-functions-business-analytics.md:130,212 - array_extract(STRUCT, DOUBLE) type mismatch

Network/HTTP Errors (External Resources)

S3 Access Denied:

• duckdb-155-release.md:56 - HTTP GET error reading ‘s3://bucket/data’ (403 Forbidden)
• duckdb-as-new-jq.md:231 - HTTP GET error reading ‘s3://my-logs-bucket/2026/05’ (403 Forbidden)
• duckdb-async-io-parquet-benchmark.md:81 - HTTP GET error reading ‘s3://bucket/large_dataset’ (403 Forbidden)
• duckdb-data-acquisition.md:162 - HTTP GET error reading ‘s3://my-bucket/sales/2026’ (403 Forbidden)
• duckdb-builtin-ui.md:134 - HTTP GET error on ‘https://d37ci6vzurychx.cloudfront.net/...' (HTTP 0)
• duckdb-production-deployment-guide.md:402,466 - HTTP GET errors on S3 paths (403 Forbidden)
• duckdb-v154-new-features.md:86,105 - HTTP GET errors on S3 paths (403 Forbidden)
• duckdb-portfolio-dashboard-html.md:297 - HTTP GET error on Yahoo Finance API (HTTP 0)
• duckdb-query-remote-files.md:91 - HTTP GET error on HuggingFace (HTTP 0)

Iceberg Authentication Issues:

• duckdb-iceberg-features.md:24,227 - AUTHORIZATION_TYPE ‘oauth2’ without secret
• duckdb-iceberg-v153-advanced-features.md:30 - AUTHORIZATION_TYPE ‘oauth2’ without secret
• duckdb-iceberg-v153-features.md:32 - AUTHORIZATION_TYPE ‘oauth2’ without secret
• duckdb-async-io-parquet-benchmark.md:187 - Failed to read iceberg table (no version provided)
• duckdb-iceberg-v153-advanced-features.md:183,283 - Failed to read iceberg table
• duckdb-iceberg-v153-features.md:204,304 - Failed to read iceberg table
• duckdb-v154-new-features.md:153 - Conflict target not referenced by UNIQUE/PRIMARY KEY

DuckDB Not-Yet-Implemented Features

CREATE MATERIALIZED VIEW:

• duckdb-json-advanced-guide.md:207
• duckdb-json-practical-workshop.md:246
• duckdb-materialized-view-incremental-refresh.md:42
• duckdb-predicate-pushdown-filter-indexes.md:194,215
• duckdb-production-deployment-guide.md:457
• duckdb-stock-screener.md:294

CREATE EXTENSION (not supported in DuckDB):

• duckdb-ecommerce-competitor-monitoring-service.md:150
• duckdb-extensionkit-csharp.md:172
• duckdb-production-deployment-guide.md:270

Other Not-Implemented:

• duckdb-ai-data-lake-lance-iceberg.md:88,110 - NameListToString NOT IMPLEMENTED
• duckdb-lance-extension-guide.md:131 - USING IVF_FLAT with = syntax
• duckdb-lance-vector-search.md:153,291 - USING IVF_FLAT syntax
• duckdb-real-time-streaming-guide.md:266 - Creating partial indexes not supported
• duckdb-json-tree-list-operations.md:52 - read_ndjson_auto used as scalar function
• duckdb-json-http-api-querying.md:37 - read_json_auto used as scalar function
• duckdb-http-api-sql-etl.md - read_text used as scalar function (multiple lines)

DBT Jinja Template Syntax (Expected Failures)

These files contain DBT model code with Jinja templates ({{ }}), which are not valid DuckDB SQL:

• duckdb-dbt-data-modeling.md:245,270,298,327,385
• duckdb-dbt-monetization-toolchain.md:158,176,205
• duckdb-dbt-report-automation.md:134,153,183

Timeout Files (5 - Likely Network/Large File Operations)

These files timed out during verification (20s limit):

1. duckdb-152-release.md
2. duckdb-performance-tuning-ultimate-guide.md
3. duckdb-data-lake-iceberg-delta-guide.md
4. duckdb-delta-lake-adhoc-query.md
5. duckdb-delta-unity-catalog-complete-guide.md

Recommendations

Critical Fixes (Syntax Errors)

1. Remove CREATE MATERIALIZED VIEW - Replace with regular VIEW or note as future feature
2. Remove CREATE EXTENSION - Use INSTALL and LOAD instead
3. Fix LOAD DATA FROM - Use COPY ... FROM or read_csv_auto()
4. Fix .. ellipsis in SQL - Replace with complete example code
5. Fix CONNECT statements - Use DuckDB’s attach/detach syntax
6. Fix Python syntax errors - Close string literals, fix indentation

API Parameter Fixes

1. Remove invalid parameters: RETURN_NULL_ON_ERROR, ROWS_PER_GROUP, SECRET_ACCESS_KEY, max_size, file_errors, data, autoparse, format
2. Use correct function signatures: read_csv_auto() only accepts specific parameters
3. Fix type mismatches: Ensure DATE+INTEGER operations use INTERVAL

Network-Dependent Code

1. Add error handling for S3/HTTP operations
2. Use local test data where possible
3. Add SET commands for Iceberg version guessing: SET unsafe_enable_version_guessing = true;

DBT Articles

1. Add note that Jinja templates require DBT compilation
2. Show compiled SQL output instead of raw templates
3. Use -- comments to mark templated sections

Timeout Issues

1. Optimize verification script for large files
2. Consider network timeout handling in verifier
3. Add skip logic for known slow operations