[Importer] Add keep-existing-columns flag

[SferaDev]

Add new flag keep-existing-columns to merge an existing table columns with the parsed types

• In the case that the guessed type is different, we don't prompt for a migration, the import will attempt to coerce the value instead and will fail if not able to coerce it

[changeset-bot]

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Latest commit: d0c81b8

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[github-actions]

size-limit report 📦

Path	Size
packages/client/dist/index.mjs	16.08 KB (0%)
packages/client/dist/index.cjs	17.27 KB (0%)
packages/codegen/dist/index.mjs	2.55 MB (0%)
packages/codegen/dist/index.cjs	2.56 MB (0%)

[github-actions]

Your pull request has been published to npm.

You can install @xata.io/client by running:

npm install @xata.io/client@0.0.0-alpha.v8d51167

Other packages are published like this:

npm install @xata.io/mypackage@0.0.0-alpha.v8d51167

To test the CLI, run:

npx @xata.io/cli@0.0.0-alpha.v8d51167

[kostasb]

Tried it out, some feedback:

with the existing table schema having brokerage as link, the CLI suggests to remove the link column (brokerage)

id,licenseNumber,licenseHolderName,licenseType,stateLicenseType,brokerage,licenseExpirationDate,address1,address2,city,county,zip,state
1,license1,name1,type1,state1,broker1,2023-07-10T16:04:33.932152Z,addr1,addr2,ny,us,16232,california

xataCli import csv agentities.csv --table=agent
✖ WARNING: The following columns will be removed and you will lose data. brokerage. 
Do you want to continue? …

(This doesn't happen with --keep-existing-columns)

[SferaDev]

Yeah, without the flag it will try to remove the link column and create an int one, this is the new default behaviour that @richardgill implemented with the new importer. There could be a discussion about if that should be the default or not, no strong preferences in this case (because we have a flag for both cases), up to @richardgill

[kostasb]

We can provide a hint to use the flag keep-existing-columns in this warning message then?