DataFrame.Join hangs indefinitely with small dataset

[zgx]

Description:

When using Microsoft.Data.Analysis DataFrame's Join method, the operation hangs indefinitely even with a very small dataset. This happens with a simple inner join operation.

Reproduction steps:

1. Create two small DataFrames:

var df1 = new DataFrame(
    new StringDataFrameColumn("Symbol", new[] { "MSFT", "AAPL", "GOOGL" }),
    new PrimitiveDataFrameColumn<double>("Price", new[] { 100.5, 150.2, 200.8 })
);

var df2 = new DataFrame(
    new StringDataFrameColumn("Symbol", new[] { "MSFT", "AAPL", "META" }),
    new PrimitiveDataFrameColumn<long>("Volume", new[] { 1000L, 1500L, 800L })
);

2. Attempt to perform an inner join:

var joinedDf = df1.Join(df2, "Symbol", "Symbol", JoinAlgorithm.Inner);

Expected behavior:
The join operation should complete quickly and return a new DataFrame containing the matched rows.

Actual behavior:
The Join operation hangs indefinitely without returning or throwing an exception.

Environment:

• OS: Windows 10
• .NET Version: 8.0.100
• Microsoft.Data.Analysis Version: 0.22.2

Additional notes:

• The dataset is very small (only 3 rows in each DataFrame)
• Both DataFrames have a common key column ("Symbol") with matching values
• Memory usage appears normal during the hang