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https://issues.apache.org/jira/browse/HIVE-25652?focusedWorklogId=672562&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-672562
]
ASF GitHub Bot logged work on HIVE-25652:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 01/Nov/21 07:16
Start Date: 01/Nov/21 07:16
Worklog Time Spent: 10m
Work Description: kasakrisz commented on a change in pull request #2752:
URL: https://github.com/apache/hive/pull/2752#discussion_r739999468
##########
File path: ql/src/java/org/apache/hadoop/hive/ql/exec/DDLPlanUtils.java
##########
@@ -800,19 +804,59 @@ private String getExternal(Table table) {
return table.getTableType() == TableType.EXTERNAL_TABLE ? "EXTERNAL " : "";
}
- private String getColumns(Table table) {
- List<String> columnDescs = new ArrayList<String>();
+ private String getColumns(Table table) throws HiveException{
+ List<String> columnDescs = new ArrayList<>();
+ Set<String> notNullColumns = null;
+ if
(NotNullConstraint.isNotNullConstraintNotEmpty(table.getNotNullConstraint())) {
+ notNullColumns = new
HashSet<>(table.getNotNullConstraint().getNotNullConstraints().values());
+ }
+
+ Map<String, String> columnDefaultValueMap = null;
+ if
(DefaultConstraint.isCheckConstraintNotEmpty(table.getDefaultConstraint())) {
+ columnDefaultValueMap =
table.getDefaultConstraint().getColNameToDefaultValueMap();
+ }
for (FieldSchema column : table.getCols()) {
String columnType =
formatType(TypeInfoUtils.getTypeInfoFromTypeString(column.getType()));
- String columnDesc = " `" + column.getName() + "` " + columnType;
+ String columnName = column.getName();
+ StringBuilder columnDesc = new StringBuilder();
+ columnDesc.append(" `").append(columnName).append("`
").append(columnType);
Review comment:
Without backticks identifiers contains special characters like space can
not be handled. See the create table example from `quotedid_basic.q` Those
characters can be used in column names too.
Yes, it requires a more complex solution but in the end we can print `CREATE
TABLE` statements which can be executed by just copy-pasting.
Probably the expression in the check constraint must be parsed to AST to
collect the identifiers and replace them with the escaped versions.
1. Example how to build the AST:
https://github.com/apache/hive/blob/8a8e03d02003aa3543f46f595b4425fd8c156ad9/ql/src/java/org/apache/hadoop/hive/ql/parse/type/ConstraintExprGenerator.java#L180
2. The AST need to be traversed to replace the identifiers.
3. Print the altered expression from AST. You need a TokenRewriteStream to
do this and currently `parseExpression` doesn't return it. So more code need to
be changed 🙂
https://github.com/apache/hive/blob/8a8e03d02003aa3543f46f595b4425fd8c156ad9/ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java#L15010
This seems to be a bigger change feel free to tackle this in a separate jira.
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Issue Time Tracking
-------------------
Worklog Id: (was: 672562)
Time Spent: 50m (was: 40m)
> Add constraints in result of “SHOW CREATE TABLE ”
> -------------------------------------------------
>
> Key: HIVE-25652
> URL: https://issues.apache.org/jira/browse/HIVE-25652
> Project: Hive
> Issue Type: Improvement
> Reporter: Soumyakanti Das
> Assignee: Soumyakanti Das
> Priority: Major
> Labels: pull-request-available
> Time Spent: 50m
> Remaining Estimate: 0h
>
> Currently show create table doesn’t pull any constraint info like not null,
> defaults, primary key.
> Example:
> Create table
>
> {code:java}
> CREATE TABLE TEST(
> col1 varchar(100) NOT NULL COMMENT "comment for column 1",
> col2 timestamp DEFAULT CURRENT_TIMESTAMP() COMMENT "comment for column 2",
> col3 decimal,
> col4 varchar(512) NOT NULL,
> col5 varchar(100),
> primary key(col1, col2) disable novalidate)
> ROW FORMAT SERDE
> 'org.apache.hadoop.hive.ql.io.orc.OrcSerde'
> STORED AS INPUTFORMAT
> 'org.apache.hadoop.hive.ql.io.orc.OrcInputFormat'
> OUTPUTFORMAT
> 'org.apache.hadoop.hive.ql.io.orc.OrcOutputFormat';
> {code}
> Currently {{SHOW CREATE TABLE TEST}} doesn't show the column constraints.
> {code:java}
> CREATE TABLE `test`(
> `col1` varchar(100) COMMENT 'comment for column 1',
> `col2` timestamp COMMENT 'comment for column 2',
> `col3` decimal(10,0),
> `col4` varchar(512),
> `col5` varchar(100))
> ROW FORMAT SERDE
> 'org.apache.hadoop.hive.ql.io.orc.OrcSerde'
> STORED AS INPUTFORMAT
> 'org.apache.hadoop.hive.ql.io.orc.OrcInputFormat'
> OUTPUTFORMAT
> 'org.apache.hadoop.hive.ql.io.orc.OrcOutputFormat'
> {code}
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