从PostgreSQL迁移至Google BigQuery：是否支持jsonb数据类型？

Hey there! Great question—when migrating from PostgreSQL to Google BigQuery, you’ll be glad to know that BigQuery offers equivalent (and in some ways streamlined) support for JSON-structured data, even though it doesn’t use the exact jsonb naming from PostgreSQL.

Key Details to Know: #

• BigQuery’s primary JSON data type is simply JSON (introduced in 2021), which behaves nearly identically to PostgreSQL’s jsonb:

  • It stores JSON in a parsed, optimized binary format—no need to reparse data during queries, just like jsonb.
  • It supports efficient querying, filtering, and indexing of nested JSON fields.
  • You can access nested values using intuitive syntax: either dot notation (e.g., my_json_column.user.name) or functions like JSON_EXTRACT/JSON_EXTRACT_SCALAR.

• For migration from PostgreSQL jsonb:

  • Most ETL tools (or even the bq load command) will automatically map PostgreSQL jsonb columns to BigQuery JSON columns during data transfer.
  • A few PostgreSQL jsonb-specific functions have minor syntax changes in BigQuery. For example:
    • PostgreSQL’s jsonb_extract_path_text('{"a":1}', 'a') becomes BigQuery’s JSON_EXTRACT_SCALAR('{"a":1}', '$.a').
  • BigQuery’s JSON type also supports automatic schema inference, which is useful if your jsonb fields have varying, unstructured schemas.

• A small difference: Unlike PostgreSQL, which has both text-based json and binary jsonb types, BigQuery only has the single JSON type—it combines the performance benefits of jsonb with the flexibility of text-based JSON, so you don’t have to choose between the two.

内容的提问来源于stack exchange，提问作者user3878636