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114 lines
3.0 KiB
C++
114 lines
3.0 KiB
C++
#pragma once
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#include <Parsers/IAST.h>
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#include <Parsers/ASTQueryWithOutput.h>
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#include <Parsers/ASTQueryWithOnCluster.h>
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namespace DB
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{
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/** ALTER query:
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* ALTER TABLE [db.]name_type
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* ADD COLUMN col_name type [AFTER col_after],
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* DROP COLUMN col_drop [FROM PARTITION partition],
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* MODIFY COLUMN col_name type,
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* DROP PARTITION partition,
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* RESHARD [COPY] PARTITION partition
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* TO '/path/to/zookeeper/table' [WEIGHT w], ...
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* USING expression
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* [COORDINATE WITH 'coordinator_id']
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*/
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class ASTAlterQuery : public ASTQueryWithOutput, public ASTQueryWithOnCluster
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{
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public:
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enum ParameterType
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{
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ADD_COLUMN,
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DROP_COLUMN,
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MODIFY_COLUMN,
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MODIFY_PRIMARY_KEY,
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DROP_PARTITION,
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ATTACH_PARTITION,
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FETCH_PARTITION,
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FREEZE_PARTITION,
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RESHARD_PARTITION,
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NO_TYPE,
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};
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struct Parameters
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{
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Parameters();
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int type = NO_TYPE;
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/** The ADD COLUMN query stores the name and type of the column to add
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* This field is not used in the DROP query
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* In MODIFY query, the column name and the new type are stored here
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*/
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ASTPtr col_decl;
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/** The ADD COLUMN query here optionally stores the name of the column following AFTER
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* The DROP query stores the column name for deletion here
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*/
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ASTPtr column;
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/** For MODIFY PRIMARY KEY
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*/
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ASTPtr primary_key;
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/** In DROP PARTITION and RESHARD PARTITION queries, the name of the partition is stored here.
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*/
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ASTPtr partition;
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bool detach = false; /// true for DETACH PARTITION
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bool part = false; /// true for ATTACH PART
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bool do_copy = false; /// for RESHARD PARTITION
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bool clear_column = false; /// for CLEAR COLUMN (do not drop column from metadata)
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/** For FETCH PARTITION - the path in ZK to the shard, from which to download the partition.
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*/
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String from;
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/** For RESHARD PARTITION.
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*/
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ASTPtr weighted_zookeeper_paths;
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ASTPtr sharding_key_expr;
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ASTPtr coordinator;
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/** For FREEZE PARTITION - place local backup to directory with specified name.
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*/
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String with_name;
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/// deep copy
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void clone(Parameters & p) const;
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};
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using ParameterContainer = std::vector<Parameters>;
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ParameterContainer parameters;
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String database;
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String table;
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void addParameters(const Parameters & params);
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explicit ASTAlterQuery(StringRange range_ = StringRange());
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/** Get the text that identifies this element. */
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String getID() const override;
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ASTPtr clone() const override;
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ASTPtr getRewrittenASTWithoutOnCluster(const std::string & new_database) const override;
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protected:
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void formatQueryImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override;
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};
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}
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