[SPARK-50991] Align the table schema column position beginning index

[turboFei]

What changes were proposed in this pull request?

Align the column start position.

Why are the changes needed?

Here the column start position is 1.

spark/sql/hive-thriftserver/src/main/java/org/apache/hive/service/cli/TableSchema.java

Lines 49 to 55 in 4af6be6

	public TableSchema(List<FieldSchema> fieldSchemas) {
	int pos = 1;
	for (FieldSchema field : fieldSchemas) {
	columns.add(new ColumnDescriptor(field.getName(), field.getComment(),
	new TypeDescriptor(field.getType()), pos++));
	}
	}

Here the column start position is 0.

spark/sql/hive-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

Lines 395 to 401 in 4af6be6

	def toTTableSchema(schema: StructType): TTableSchema = {
	val tTableSchema = new TTableSchema()
	CharVarcharUtils.getRawSchema(schema).zipWithIndex.foreach { case (f, i) =>
	tTableSchema.addToColumns(toTColumnDesc(f, i))
	}
	tTableSchema
	}

Does this PR introduce any user-facing change?

No.

How was this patch tested?

GA.

Was this patch authored or co-authored using generative AI tooling?

No.

[MaxGekk]

Hive still counts the position from 1:
https://github.com/apache/hive/blob/master/service/src/java/org/apache/hive/service/cli/TableSchema.java#L51