Wrongly handling non-numeric values of double type during the conversion from Delta

[emilie-wang]

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Please describe the bug 🐞

This error happened during the translation of column stats from Delta → internal table →Iceberg. There is an edge case, when the double type field’s value is non-numeric like "NaN" or "Infinity", the value type become String when processing the snapshot from Delta source.

...INFO org.apache.xtable.iceberg.IcebergColumnStatsConverter:76 - name=weight, fieldType=double, valueType=class java.lang.String, getMinValue=-Infinity 
...INFO org.apache.xtable.iceberg.IcebergColumnStatsConverter:80 - name=weight, fieldType=double, valueType=class java.lang.String, getMaxValue=NaN

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