Support Snowflake

[kanata2]

This is an initial implementation for Snowflake.
(If snowflake support is not needed for tbls, please close this PR 🙏 )

Note

I'm not sure what to do with the testing environment.
So I don't add test cases to snowflake driver yet.

Demo

The following is DDLs and configurations.

create schema tbls_sample;
use schema tbls_sample;
create or replace table tbls_sample (
  id int primary key
  , ext_id int
  , raw variant
  , created_at timestamp_ltz
  , updated_at timestamp_ltz
  , unique (ext_id)
);

dsn: snowflake:/<user>:<password>@<account_id>.ap-northeast-1.aws/SANDBOX/TBLS_SAMPLE
docPath: doc/schema

TBLS_SAMPLE.md

# TBLS_SAMPLE

Description

Table Definition

create or replace TABLE TBLS_SAMPLE (
	ID NUMBER(38,0) NOT NULL,
	EXT_ID NUMBER(38,0),
	RAW VARIANT,
	CREATED_AT TIMESTAMP_LTZ(9),
	UPDATED_AT TIMESTAMP_LTZ(9),
	unique (EXT_ID),
	primary key (ID)
);

Columns

Name	Type	Default	Nullable	Children	Parents	Comment
ID	NUMBER		false
EXT_ID	NUMBER		true
RAW	VARIANT		true
CREATED_AT	TIMESTAMP_LTZ		true
UPDATED_AT	TIMESTAMP_LTZ		true

Relations

---

Generated by tbls

</details>

[codecov]

Codecov Report

Merging #267 (9ccbb93) into master (670dc8a) will decrease coverage by 1.35%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #267      +/-   ##
==========================================
- Coverage   68.72%   67.37%   -1.36%     
==========================================
  Files          23       23              
  Lines        3831     3859      +28     
==========================================
- Hits         2633     2600      -33     
- Misses        940     1005      +65     
+ Partials      258      254       -4     

Impacted Files	Coverage Δ
datasource/datasource.go	21.96% <0.00%> (-12.96%)	⬇️
schema/schema.go	29.10% <0.00%> (-4.04%)	⬇️
config/config.go	51.35% <0.00%> (-0.56%)	⬇️

---

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[k1LoW]

@kanata2 GREAT WORK!!!!! Thank you!!!!!

I'm not sure what to do with the testing environment.

I'm not able to have a persistent test environment for snowflake as well as you.

If I put snowflake support in tbls, is it ok to make it "experimental support"?

Also, is it possible to commit the following files?

1. a sample DDL similar to other data sources ( in testdata/ )
2. a sample document generated by tbls doc for the database created in 1 ( in sample/ )

[kanata2]

Thank you!

If I put snowflake support in tbls, is it ok to make it "experimental support"?

I think it's good. Thank you for your consideration 🙏 🙏

Also, is it possible to commit the following files?

Okay, I'll add these files later.

[k1LoW]

Hi @kanata2

1. a sample DDL similar to other data sources ( in testdata/ )

If you have access to SNOWFLAKE_SAMPLE_DATA, use it. No new DDL is needed.

[kanata2]

Ah, it's good idea!
I'll use SNOWFLAKE_SAMPLE_DATA.TPCH_SF1.

[kanata2]

I'm sorry.
In shared database, it seems that the GET_DDL function does not allow, so I'll add self-created DDL based on SNOWFLAKE_SAMPLE_DATA and its result this time.
If there are many requests to run tbls against a shared DB in the future, I'll switch to an implementation that doesn't use GET_DDL.(What do you think?)

[k1LoW]

@kanata2
Looks good. No problem. 👍

[kanata2]

Just added DDL and output files in 9ccbb93.

[k1LoW]

@kanata2 Thank you for your great commit!!