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Added support for add column and drop column #41

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@subkanthi subkanthi commented Jun 30, 2025 •
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closes: #39

@subkanthi subkanthi linked an issue Jun 30, 2025 that may be closed by this pull request
Add a column to an existing table #39
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subkanthi
subkanthi commented Jul 1, 2025
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ice/src/main/java/com/altinity/ice/cli/internal/cmd/AddColumn.java Outdated
Types.NestedField field;

switch (type.toLowerCase()) {
case "string":
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couldn't find any mapper from string to iceberg Types

subkanthi
subkanthi commented Jul 1, 2025
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ice/src/main/java/com/altinity/ice/cli/internal/cmd/AddColumn.java Outdated
return new ColumnSpec(columnName, field.type(), comment);
}

private static Types.NestedField parseColumnType(String name, String type, String comment) {
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maybe this needs to be moved to a common class for field mapping.

@subkanthi subkanthi marked this pull request as ready for review July 1, 2025 21:14
shyiko
shyiko requested changes Jul 8, 2025
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I think we should go with @aadant's proposal #39 (comment). Separate add-column/delete-column commands instead of single alter-table means you can't combine multiple changes in a single transaction.

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alter-table flowers.iris --operations '[{"drop": "age"}]'
2025-07-10 15:41:35 [main] INFO c.a.i.c.i.cmd.AlterTable > Dropping column 'age' from table: flowers.iris
2025-07-10 15:41:36 [main] INFO c.a.i.c.i.cmd.AlterTable > Successfully applied 1 operations to table: flowers.iris

Invalid operation

alter-table flowers.iris --operations '[{"rename": "age"}]'
2025-07-10 15:54:17 [main] ERROR com.altinity.ice.cli.Main > Fatal
java.lang.IllegalArgumentException: Invalid operation. Supported operations: add, drop
        at com.altinity.ice.cli.internal.cmd.AlterTable.validateOperation(AlterTable.java:117)
        at com.altinity.ice.cli.internal.cmd.AlterTable.run(AlterTable.java:65)
        at com.altinity.ice.cli.Main.alterTable(Main.java:459)
        at com.altinity.ice.cli.Main.lambda$main$0(Main.java:551) [9 skipped]
        at com.altinity.ice.cli.Main.main(Main.java:558) [1 skipped]

@subkanthi subkanthi requested a review from shyiko July 11, 2025 15:11
shyiko
shyiko reviewed Jul 11, 2025
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ice/src/main/java/com/altinity/ice/cli/Main.java Outdated
names = {"--operations"},
required = true,
description =
"JSON array of operations: [{'add': 'age:int:User age'}, {'drop': 'col_name'}]")
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It would be best to stick to yaml/json for this as column names may contain colons, future operations may not be so easy to express in colon-separated values, etc.

It would also be nice if operation/files names would follow https://iceberg.apache.org/docs/latest/spark-ddl/#alter-table-rename-column naming.

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Add a column to an existing table
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