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query.go
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query.go
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package hive
import (
"fmt"
"strings"
)
func generateDropTableSQL(database, tableName string, ignoreNotExists, purge bool) string {
ifExists := ""
if ignoreNotExists {
ifExists = "IF EXISTS"
}
purgeStr := ""
if purge {
purgeStr = "PURGE"
}
if database != "" {
tableName = fmt.Sprintf("%s.%s", database, tableName)
}
return fmt.Sprintf("DROP TABLE %s %s %s", ifExists, tableName, purgeStr)
}
// generateCreateTableSQL returns a query for a CREATE statement which instantiates a new external Hive table.
// If is external is set, an external Hive table will be used.
func generateCreateTableSQL(params TableParameters, ignoreExists bool) string {
columnsStr := generateColumnListSQL(params.Columns)
tableType := ""
if params.External {
tableType = "EXTERNAL"
}
ifNotExists := ""
if ignoreExists {
ifNotExists = "IF NOT EXISTS"
}
tableName := params.Name
if params.Database != "" {
tableName = fmt.Sprintf("%s.%s", params.Database, tableName)
}
partitionedBy := ""
if len(params.PartitionedBy) != 0 {
partitionedBy = fmt.Sprintf("PARTITIONED BY (%s)", generateColumnListSQL(params.PartitionedBy))
}
clusteredBy := ""
intoBuckets := ""
sortedBy := ""
if len(params.ClusteredBy) != 0 {
clusteredBy = fmt.Sprintf("CLUSTERED BY (%s)", generateColumnNoTypesListSQL(params.ClusteredBy))
intoBuckets = fmt.Sprintf("INTO %d BUCKETS", params.NumBuckets)
if len(params.SortedBy) != 0 {
sortedBy = fmt.Sprintf("SORTED BY (%s)", generateSortedByColumnListSQL(params.SortedBy))
}
}
rowFormatStr := ""
if params.RowFormat != "" {
rowFormatStr = fmt.Sprintf("ROW FORMAT %s", strings.TrimSpace(params.RowFormat))
}
format := ""
if params.FileFormat != "" {
format = fmt.Sprintf("STORED AS %s", params.FileFormat)
}
location := ""
if params.Location != "" {
location = fmt.Sprintf(`LOCATION "%s"`, params.Location)
}
tblProps := ""
if params.TableProperties != nil {
tblProps = fmt.Sprintf("TBLPROPERTIES(%s)", params.TableProperties)
}
return fmt.Sprintf(
`CREATE %s TABLE %s
%s (%s) %s
%s %s %s
%s %s %s
%s`,
tableType, ifNotExists,
tableName, columnsStr, partitionedBy,
clusteredBy, sortedBy, intoBuckets,
rowFormatStr, format, location,
tblProps,
)
}
func generateCreateDatabaseSQL(params DatabaseParameters, ignoreExists bool) string {
ignoreExistsStr := ""
if params.Location != "" {
ignoreExistsStr = "IF NOT EXISTS"
}
locStr := ""
if params.Location != "" {
locStr = fmt.Sprintf("LOCATION '%s'", params.Location)
}
return fmt.Sprintf(
`CREATE DATABASE
%s
%s
%s`, ignoreExistsStr, params.Name, locStr)
}
func generateDropDatabaseSQL(dbName string, ignoreNotExists, cascade bool) string {
ifExists := ""
if ignoreNotExists {
ifExists = "IF EXISTS"
}
cascadeStr := ""
if cascade {
cascadeStr = "CASCADE"
}
return fmt.Sprintf(
`DROP DATABASE
%s
%s
%s`, ifExists, dbName, cascadeStr)
}
// generateColumnListSQL returns a Hive CREATE column string from a slice of
// name/type pairs. For example, "columnName string".
func generateColumnListSQL(columns []Column) string {
c := make([]string, len(columns))
for i, col := range columns {
c[i] = escapeColumn(col.Name, col.Type)
}
return strings.Join(c, ",")
}
func generateColumnNoTypesListSQL(columns []string) string {
c := make([]string, len(columns))
for i, col := range columns {
c[i] = "`" + col + "`"
}
return strings.Join(c, ",")
}
func generateSortedByColumnListSQL(columns []SortColumn) string {
c := make([]string, len(columns))
for i, col := range columns {
val := "`" + col.Name + "`"
if col.Decending != nil {
if *col.Decending {
val += " DESC"
} else {
val += " ASC"
}
}
c[i] = val
}
return strings.Join(c, ",")
}
func escapeColumn(columnName, columnType string) string {
return fmt.Sprintf("`%s` %s", columnName, columnType)
}