Revert "[GLUTEN-6176][CH] Add tpcds suite from decimal table schema (a…

…pache#6369)"

This reverts commit 3c50ffe.

backends-clickhouse/src/main/scala/org/apache/gluten/backendsapi/clickhouse/CHSparkPlanExecApi.scala

@@ -57,7 +57,7 @@ import org.apache.spark.sql.execution.joins.{BuildSideRelation, ClickHouseBuildS
 import org.apache.spark.sql.execution.metric.SQLMetric
 import org.apache.spark.sql.execution.utils.{CHExecUtil, PushDownUtil}
 import org.apache.spark.sql.extension.{CommonSubexpressionEliminateRule, RewriteDateTimestampComparisonRule}
-import org.apache.spark.sql.types.{DecimalType, StructType}
+import org.apache.spark.sql.types.StructType
 import org.apache.spark.sql.vectorized.ColumnarBatch
 
 import org.apache.commons.lang3.ClassUtils
@@ -900,10 +900,4 @@ class CHSparkPlanExecApi extends SparkPlanExecApi {
   override def genPreProjectForGenerate(generate: GenerateExec): SparkPlan = generate
 
   override def genPostProjectForGenerate(generate: GenerateExec): SparkPlan = generate
-
-  override def genDecimalRoundExpressionOutput(
-      decimalType: DecimalType,
-      toScale: Int): DecimalType = {
-    SparkShimLoader.getSparkShims.genDecimalRoundExpressionOutput(decimalType, toScale)
-  }
 }