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https://issues.apache.org/jira/browse/IGNITE-11434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16809696#comment-16809696
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Taras Ledkov commented on IGNITE-11434:
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[~vozerov], lets discuss more details:
1. I see no difference between two internal info: out CACHE_ID for a table and
COLUMN_ID for a column. Should we add ORDINAL_POSITION instead COLUMN_ID?
2. Now Ignite supports use default partially value (only for INSERT).
3. Agreed.
4. Ok. This field is strange. H2 uses {{precision}} for CHAR/VARCHAR types and
for NUMBERs. Should we split this info at the COLUMNS view into:
{{CHARACTER_LENGTH, NUMBER_PRECISION, NUMBER_SCALE}} like postgres, mysql, etc?
5. Agreed.
6. Agreed. Should we add additional columns to the view to display wrap/unwrap
info?
Should we add add some additional columns to implement JDBC columns metadata
through SELECT from COLUMNS view?
> SQL: Create a view with list of existing COLUMNS
> ------------------------------------------------
>
> Key: IGNITE-11434
> URL: https://issues.apache.org/jira/browse/IGNITE-11434
> Project: Ignite
> Issue Type: Task
> Components: sql
> Reporter: Yury Gerzhedovich
> Assignee: Taras Ledkov
> Priority: Major
> Labels: iep-29
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> Need to expose SQL system view with COLUMNS information.
> Need to investigate more deeper which of information should be there.
>
> As start point we can take
> [https://dev.mysql.com/doc/refman/8.0/en/columns-table.html]
> Columns description:
> || Name || Type || Description||
> | SCHEMA_NAME | string | Schema name |
> | TABLE_NAME | string | Table name |
> | COLUMN_ID | int | Column ID |
> | COLUMN_NAME | string | Column name |
> | DEFAULT VALUE | string | Defaut column's value |
> | IS_NULLABLE | boolean | Nullable flag corresponds to
> {{QueryEntity#setNotNullFields}} |
> | SQL TYPE | int | SQL data type ID |
> | DATA_TYPE | string | SQL data type |
> | DISPLAY_SIZE| int | Size (e.g. for VARCHAR) |
> | PRECISION | int | Precision |
> | SCALE | int | Scale |
> | AFFINITY_KEY | boolean | {{true}} whan the column is affinity key |
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