Table.ExpandTableColumn

Syntax

Table.ExpandTableColumn(
    table as table,
    column as text,
    columnNames as list,
    optional newColumnNames as nullable list
) as table

About

Expands tables in table[column] into multiple rows and columns. columnNames is used to select the columns to expand from the inner table. Specify newColumnNames to avoid conflicts between existing columns and new columns.

Example

Expand table columns in [a] in the table ({[t = {[a=1, b=2, c=3], [a=2,b=4,c=6]}, b = 2]}) into 3 columns [t.a], [t.b] and [t.c].

Usage

Table.ExpandTableColumn(
    Table.FromRecords({
        [
            t = Table.FromRecords({
                [a = 1, b = 2, c = 3],
                [a = 2, b = 4, c = 6]
            }),
            b = 2
        ]
    }),
    "t",
    {"a", "b", "c"},
    {"t.a", "t.b", "t.c"}
)

Output

Table.FromRecords({
    [t.a = 1, t.b = 2, t.c = 3, b = 2],
    [t.a = 2, t.b = 4, t.c = 6, b = 2]
})