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Could not handle BIGNUMERICs while reading

See original GitHub issue

We are unable to read from bigquery getting below exception while reading BIGNUMERIC data types:

Exception in thread "main" java.lang.IllegalStateException: Unexpected type: BIGNUMERIC
	at com.google.cloud.spark.bigquery.SchemaConverters.getStandardDataType(SchemaConverters.java:234)
	at com.google.cloud.spark.bigquery.SchemaConverters.lambda$getDataType$4(SchemaConverters.java:184)
	at java.util.Optional.orElseGet(Optional.java:267)
	at com.google.cloud.spark.bigquery.SchemaConverters.getDataType(SchemaConverters.java:184)
	at com.google.cloud.spark.bigquery.SchemaConverters.convert(SchemaConverters.java:166)
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
	at java.util.Iterator.forEachRemaining(Iterator.java:116)
	at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
	at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
	at com.google.cloud.spark.bigquery.SchemaConverters.toSpark(SchemaConverters.java:54)
	at com.google.cloud.spark.bigquery.BigQueryRelation.<init>(BigQueryRelation.scala:37)
	at com.google.cloud.spark.bigquery.direct.DirectBigQueryRelation.<init>(DirectBigQueryRelation.scala:48)
	at com.google.cloud.spark.bigquery.BigQueryRelationProvider.createRelationInternal(BigQueryRelationProvider.scala:78)
	at com.google.cloud.spark.bigquery.BigQueryRelationProvider.createRelation(BigQueryRelationProvider.scala:45)
	at org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:318)
	at org.apache.spark.sql.DataFrameReader.loadV1Source(DataFrameReader.scala:223)
	at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:211)
	at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:167)```