Skip to content

index.md

Latest commit

 

History

History
185 lines (149 loc) · 13.1 KB

index.md

File metadata and controls

185 lines (149 loc) · 13.1 KB
title PostgreSQL Data Connector
sidebar_label PostgreSQL Data Connector
description PostgreSQL Data Connector Documentation

PostgreSQL is an advanced open-source relational database management system known for its robustness, extensibility, and support for SQL compliance.

The PostgreSQL Server Data Connector enables federated/accelerated SQL queries on data stored in PostgreSQL databases.

datasets:
  - from: postgres:my_table
    name: my_dataset
    params: ...

Configuration

from

The from field takes the form postgres:my_table where my_table is the table identifer in the PostgreSQL server to read from.

The fully-qualified table name (database.schema.table) can also be used in the from field.

datasets:
  - from: postgres:my_database.my_schema.my_table
    name: my_dataset
    params: ...

name

The dataset name. This will be used as the table name within Spice.

Example:

datasets:
  - from: postgres:my_database.my_schema.my_table
    name: cool_dataset
    params: ...
SELECT COUNT(*) FROM cool_dataset;
+----------+
| count(*) |
+----------+
| 6001215  |
+----------+

params

The connection to PostgreSQL can be configured by providing the following params:

Parameter Name Description
pg_host The hostname of the PostgreSQL server.
pg_port The port of the PostgreSQL server.
pg_db The name of the database to connect to.
pg_user The username to connect with.
pg_pass The password to connect with. Use the secret replacement syntax to load the password from a secret store, e.g. ${secrets:my_pg_pass}.
pg_sslmode Optional. Specifies the SSL/TLS behavior for the connection, supported values:
  • verify-full: This mode requires an SSL connection, a valid root certificate, and the server host name to match the one specified in the certificate.
  • verify-ca: This mode requires a TLS connection and a valid root certificate.
  • require: This mode requires a TLS connection.
  • prefer: (default) This mode will try to establish a secure TLS connection if possible, but will connect insecurely if the server does not support TLS.
  • disable: This mode will not attempt to use a TLS connection, even if the server supports it.
pg_sslrootcert Optional parameter specifying the path to a custom PEM certificate that the connector will trust.
pg_connection_pool_min_idle Optional. The minimum number of idle connections to keep open in the pool. Default is 1.
connection_pool_size Optional. The maximum number of connections to keep open in the connection pool. Default is 5.

Types

The table below shows the PostgreSQL data types supported, along with the type mapping to Apache Arrow types in Spice.

PostgreSQL Type Arrow Type
int2 Int16
int4 Int32
int8 Int64
money Int64
float4 Float32
float8 Float64
numeric Decimal128
text Utf8
varchar Utf8
bpchar Utf8
uuid Utf8
bytea Binary
bool Boolean
json Utf8
timestamp Timestamp(Nanosecond, None)
timestamptz Timestamp(Nanosecond, UTC)
date Date32
time Time64(Nanosecond)
interval Interval(MonthDayNano)
point FixedSizeList(Float64[2])
int2[] List(Int16)
int4[] List(Int32)
int8[] List(Int64)
float4[] List(Float32)
float8[] List(Float64)
text[] List(Utf8)
bool[] List(Boolean)
bytea[] List(Binary)
geometry Binary
geography Binary
enum Dictionary(Int8, Utf8)
Composite Types Struct

:::info

The Postgres federated queries may result in unexpected result types due to the difference in DataFusion and Postgres size increase rules. Please explicitly specify the expected output type of aggregation functions when writing query involving Postgres table in Spice. For example, rewrite SUM(int_col) into CAST (SUM(int_col) as BIGINT.

:::

Examples

Connecting using Username/Password

datasets:
  - from: postgres:my_database.my_schema.my_table
    name: my_dataset
    params:
      pg_host: localhost
      pg_port: 5432
      pg_db: my_database
      pg_user: my_user
      pg_pass: ${secrets:my_pg_pass}

Connect using SSL

datasets:
  - from: postgres:my_database.my_schema.my_table
    name: my_dataset
    params:
      pg_host: localhost
      pg_port: 5432
      pg_db: my_database
      pg_user: my_user
      pg_pass: ${secrets:my_pg_pass}
      pg_sslmode: verify-ca
      pg_sslrootcert: ./custom_cert.pem

Separate dataset/accelerator secrets

Specify different secrets for a PostgreSQL source and acceleration:

datasets:
  - from: postgres:my_schema.my_table
    name: my_dataset
    params:
      pg_host: localhost
      pg_port: 5432
      pg_db: my_database
      pg_user: my_user
      pg_pass: ${secrets:pg1_pass}
    acceleration:
      engine: postgres
      params:
        pg_host: localhost
        pg_port: 5433
        pg_db: acceleration
        pg_user: two_user_two_furious
        pg_pass: ${secrets:pg2_pass}

Secrets

Spice integrates with multiple secret stores to help manage sensitive data securely. For detailed information on supported secret stores, refer to the secret stores documentation. Additionally, learn how to use referenced secrets in component parameters by visiting the using referenced secrets guide.

Cookbook