Attili-sys 5fc254eb2e Feature big query connector (#15871) ...

### What problem does this PR solve?

This PR adds Google BigQuery as a first-class data source connector in
RAGFlow.

It enables users to ingest and sync BigQuery data using the same
row-to-document model used by relational database connectors: selected
content columns become document text, metadata columns become document
metadata, an optional ID column provides stable document IDs, and an
optional timestamp column enables cursor-based incremental sync.

The connector supports service-account JSON credentials, table mode,
custom query mode, GoogleSQL queries, cursor-based incremental sync,
deleted-row pruning support, configurable query limits such as
`maximum_bytes_billed`, dry-run validation, batch loading, stable
document IDs, and BigQuery-aware value serialization.

2026-06-29 22:08:40 +08:00

88 KiB

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