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From paul-rogers <...@git.apache.org>
Subject [GitHub] drill pull request #666: DRILL-4956: Temporary tables support
Date Tue, 06 Dec 2016 06:12:26 GMT
Github user paul-rogers commented on a diff in the pull request:

    https://github.com/apache/drill/pull/666#discussion_r90699251
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/handlers/ViewHandler.java
---
    @@ -74,36 +74,51 @@ public PhysicalPlan getPlan(SqlNode sqlNode) throws ValidationException,
RelConv
           final SchemaPlus defaultSchema = context.getNewDefaultSchema();
           final AbstractSchema drillSchema = SchemaUtilites.resolveToMutableDrillSchema(defaultSchema,
createView.getSchemaPath());
     
    -      final String schemaPath = drillSchema.getFullSchemaName();
           final View view = new View(newViewName, viewSql, newViewRelNode.getRowType(),
               SchemaUtilites.getSchemaPathAsList(defaultSchema));
     
    -      final Table existingTable = SqlHandlerUtil.getTableFromSchema(drillSchema, newViewName);
    +      validateViewCreationPossibility(drillSchema, newViewName, createView.getReplace());
    +
    +      final boolean replaced = drillSchema.createView(view);
    +      final String summary = String.format("View '%s' %s successfully in '%s' schema",
    +          createView.getName(), replaced ? "replaced" : "created", drillSchema.getFullSchemaName());
    +
    +      return DirectPlan.createDirectPlan(context, true, summary);
    +    }
    +
    +    /**
    +     * Validates if view can be created in indicated schema:
    +     * checks if object (persistent / temporary table) with the same exists
    +     * in indicated schema, or if view exists but replace flag is not set.
    +     *
    +     * @param drillSchema schema where views will be created
    +     * @param viewName view name
    +     * @param replaceView replace view if exists
    +     * @throws UserException if views can be created in indicated schema
    +     */
    +    private void validateViewCreationPossibility(AbstractSchema drillSchema, String viewName,
boolean replaceView) {
    --- End diff --
    
    Maybe answered later. If we create a view on a temp table, is the view itself temporary
for the session only?


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