# Arrow without ADBC · access · 2026

Revision 1 (11 October 2026) · Modeled snapshot · through 8 October 2026.

All figures are research-informed estimates of analytical activity. Significant errors may remain; decimal places do not imply measurement precision.

3.9525% of the full access layer.

[Arrow without ADBC](https://history.columnar.tech/technologies/access/arrow.md): historical names and annual shares.

Direct use of engine-served Arrow results through an Arrow API, Arrow over HTTP, Flight/Flight SQL, or an embedded Arrow interface. Client-side conversion of ODBC or other row results does not qualify. ADBC use is counted separately. Spark Connect is included from its 2023 introduction.

Direct Arrow and ADBC are exclusive boxes. Together they form an Arrow family of 6% of access.

## Contributions by compute engine

Each figure is a share of the full access layer.

| Engine | Share of full access layer | Engine connections |
| --- | --- | --- |
| [Databricks](https://history.columnar.tech/technologies/compute/databricks.md) | 1% | [Inspect engine](https://history.columnar.tech/connections/2026/compute/databricks.md) |
| [Snowflake](https://history.columnar.tech/technologies/compute/snowflake.md) | 0.9% | [Inspect engine](https://history.columnar.tech/connections/2026/compute/snowflake.md) |
| [Google BigQuery](https://history.columnar.tech/technologies/compute/bigquery.md) | 0.5% | [Inspect engine](https://history.columnar.tech/connections/2026/compute/bigquery.md) |
| [Apache Spark (including Amazon EMR, Synapse Spark, and Google Cloud Dataproc)](https://history.columnar.tech/technologies/compute/spark.md) | 0.4% | [Inspect engine](https://history.columnar.tech/connections/2026/compute/spark.md) |
| [Dremio](https://history.columnar.tech/technologies/compute/dremio.md) | 0.3% | [Inspect engine](https://history.columnar.tech/connections/2026/compute/dremio.md) |
| [DuckDB](https://history.columnar.tech/technologies/compute/duckdb.md) | 0.3% | [Inspect engine](https://history.columnar.tech/connections/2026/compute/duckdb.md) |
| [Apache DataFusion](https://history.columnar.tech/technologies/compute/datafusion.md) | 0.3% | [Inspect engine](https://history.columnar.tech/connections/2026/compute/datafusion.md) |
| [ClickHouse](https://history.columnar.tech/technologies/compute/clickhouse.md) | 0.2% | [Inspect engine](https://history.columnar.tech/connections/2026/compute/clickhouse.md) |
| [Apache Doris](https://history.columnar.tech/technologies/compute/doris.md) | <0.1% | [Inspect engine](https://history.columnar.tech/connections/2026/compute/doris.md) |
| [StarRocks](https://history.columnar.tech/technologies/compute/starrocks.md) | <0.1% | [Inspect engine](https://history.columnar.tech/connections/2026/compute/starrocks.md) |
| [Teradata](https://history.columnar.tech/technologies/compute/teradata.md) | <0.1% | [Inspect engine](https://history.columnar.tech/connections/2026/compute/teradata.md) |
| [PostgreSQL family](https://history.columnar.tech/technologies/compute/postgres.md) | <0.1% | [Inspect engine](https://history.columnar.tech/connections/2026/compute/postgres.md) |

[All percentages for 2026](https://history.columnar.tech/years/2026.md)

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[Markdown overview](https://history.columnar.tech/index.md) · [Interactive visualization](https://history.columnar.tech/?2026) · [Methodology](https://history.columnar.tech/methodology.md) · [Terms of use](https://history.columnar.tech/terms.md)

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