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| author | gatorsmile <gatorsmile@gmail.com> | 2016-07-13 15:23:37 -0700 |
|---|---|---|
| committer | Yin Huai <yhuai@databricks.com> | 2016-07-13 15:23:37 -0700 |
| commit | c5ec879828369ec1d21acd7f18a792306634ff74 (patch) | |
| tree | 4a50a0a09e2143e7163f7854009cbec4c959bcdb /python | |
| parent | fb2e8eeb0b1e56bea535165f7a3bec6558b3f4a3 (diff) | |
| download | spark-c5ec879828369ec1d21acd7f18a792306634ff74.tar.gz spark-c5ec879828369ec1d21acd7f18a792306634ff74.tar.bz2 spark-c5ec879828369ec1d21acd7f18a792306634ff74.zip | |
[SPARK-16482][SQL] Describe Table Command for Tables Requiring Runtime Inferred Schema
#### What changes were proposed in this pull request?
If we create a table pointing to a parquet/json datasets without specifying the schema, describe table command does not show the schema at all. It only shows `# Schema of this table is inferred at runtime`. In 1.6, describe table does show the schema of such a table.
~~For data source tables, to infer the schema, we need to load the data source tables at runtime. Thus, this PR calls the function `lookupRelation`.~~
For data source tables, we infer the schema before table creation. Thus, this PR set the inferred schema as the table schema when table creation.
#### How was this patch tested?
Added test cases
Author: gatorsmile <gatorsmile@gmail.com>
Closes #14148 from gatorsmile/describeSchema.
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