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doc: Datatype documentation #234

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Nov 28, 2023
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doc: Datatype documentation #234

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66 changes: 66 additions & 0 deletions README.md
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Expand Up @@ -149,3 +149,69 @@ meltano invoke target-postgres --version

See the [dev guide](https://sdk.meltano.com/en/latest/dev_guide.html) for more instructions on how to use the Meltano SDK to
develop your own Singer taps and targets.

## Data Types

The below table shows how this tap will map between jsonschema datatypes and Postgres datatypes.

| jsonschema | Postgres |
|--------------------------------|-----------------------------------------|
| integer | bigint |
| UNSUPPORTED | bigserial |
| UNSUPPORTED | bit [ (n) ] |
| UNSUPPORTED | bit varying [ (n) ] |
| boolean | boolean |
| UNSUPPORTED | box |
| UNSUPPORTED | bytea |
| UNSUPPORTED | character [ (n) ] |
| UNSUPPORTED | character varying [ (n) ] |
| UNSUPPORTED | cidr |
| UNSUPPORTED | circle |
| string with format="date" | date |
| UNSUPPORTED | double precision |
| UNSUPPORTED | inet |
| UNSUPPORTED | integer |
| UNSUPPORTED | interval [ fields ] [ (p) ] |
| UNSUPPORTED | json |
| array; object | jsonb |
| UNSUPPORTED | line |
| UNSUPPORTED | lseg |
| UNSUPPORTED | macaddr |
| UNSUPPORTED | macaddr8 |
| UNSUPPORTED | money |
| number | numeric [ (p, s) ] |
| UNSUPPORTED | path |
| UNSUPPORTED | pg_lsn |
| UNSUPPORTED | pg_snapshot |
| UNSUPPORTED | point |
| UNSUPPORTED | polygon |
| UNSUPPORTED | real |
| UNSUPPORTED | smallint |
| UNSUPPORTED | smallserial |
| UNSUPPORTED | serial |
| string without format; untyped | text |
| string with format="time" | time [ (p) ] [ without time zone ] |
| UNSUPPORTED | time [ (p) ] with time zone |
| string with format="date-time" | timestamp [ (p) ] [ without time zone ] |
| UNSUPPORTED | timestamp [ (p) ] with time zone |
| UNSUPPORTED | tsquery |
| UNSUPPORTED | tsvector |
| UNSUPPORTED | txid_snapshot |
| UNSUPPORTED | uuid |
| UNSUPPORTED | xml |

Note that while object types are mapped directly to jsonb, array types are mapped to a jsonb array.

If a column has multiple jsonschema types, the following order is using to order Postgres types, from highest priority to lowest priority.
- ARRAY(JSONB)
- JSONB
- TEXT
- TIMESTAMP
- DATETIME
- DATE
- TIME
- DECIMAL
- BIGINT
- INTEGER
- BOOLEAN
- NOTYPE
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