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https://issues.apache.org/jira/browse/DRILL-7458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17019608#comment-17019608
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ASF GitHub Bot commented on DRILL-7458:
---------------------------------------
arina-ielchiieva commented on pull request #1914: DRILL-7458: Base framework
for storage plugins
URL: https://github.com/apache/drill/pull/1914#discussion_r368556609
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/store/base/filter/ConstantHolder.java
##########
@@ -0,0 +1,172 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.drill.exec.store.base.filter;
+
+import org.apache.drill.common.types.TypeProtos.MinorType;
+import org.apache.drill.exec.store.base.PlanStringBuilder;
+import org.joda.time.DateTimeZone;
+import org.joda.time.format.DateTimeFormatter;
+import org.joda.time.format.ISODateTimeFormat;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonPropertyOrder;
+
+/**
+ * Description of a constant argument of an expression.
+ */
+
+@JsonPropertyOrder({"type", "value"})
+public class ConstantHolder {
+ @JsonProperty("type")
+ public final MinorType type;
+ @JsonProperty("value")
+ public final Object value;
+
+ @JsonCreator
+ public ConstantHolder(
+ @JsonProperty("type") MinorType type,
+ @JsonProperty("value") Object value) {
+ this.type = type;
+ this.value = value;
+ }
+
+ public ConstantHolder convertTo(MinorType toType) {
+ if (type == toType) {
+ return this;
+ }
+ switch (toType) {
+ case INT:
+ return toInt();
+ case BIGINT:
+ return toBigInt();
+ case TIMESTAMP:
+ return toTimestamp(null);
+ case VARCHAR:
+ return toVarChar();
+ default:
+ throw conversionError(toType);
+ }
+ }
+
+ public ConstantHolder normalize(MinorType toType) {
+ try {
+ return convertTo(toType);
+ } catch (Throwable e) {
+ return null;
Review comment:
Maybe to add debug at list, we might need to know what is the problem at
some point.
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> Base storage plugin framework
> -----------------------------
>
> Key: DRILL-7458
> URL: https://issues.apache.org/jira/browse/DRILL-7458
> Project: Apache Drill
> Issue Type: Improvement
> Reporter: Paul Rogers
> Assignee: Paul Rogers
> Priority: Major
> Labels: doc-impacting
> Fix For: 1.18.0
>
>
> The "Easy" framework allows third-parties to add format plugins to Drill with
> moderate effort. (The process could be easier, but "Easy" makes it as simple
> as possible given the current structure.)
> At present, no such "starter" framework exists for storage plugins. Further,
> multiple storage plugins have implemented filter push down, seemingly by
> copying large blocks of code.
> This ticket offers a "base" framework for storage plugins and for filter
> push-downs. The framework builds on the EVF, allowing plugins to also support
> project push down.
> The framework has a "test mule" storage plugin to verify functionality, and
> was used as the basis of an REST-like plugin.
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